We do not rule out the possibility of errors in this list. We will do our best to correct them as soon as possible.
In ATEX, gases and vapours are classified according to two different but complementary criteria (gas group vs. temperature class), which is why they go hand in hand in the marking of ATEX equipment.
The classification of gases from an ATEX standpoint is based on three main parameters:
| Parameter | Description |
| MESG (Maximum Experimental Safe Gap) | The maximum gap through which a flame can escape. The lower the required value, the more hazardous the gas. |
| MIE (Minimum Ignition Energy) | The minimum energy required to initiate ignition. Lower values indicate higher hazard. |
| Representative Gas / Example | A “model” gas typically associated with each group is used as a reference. |
This classification is important because it determines gases’ sensitivity to ignition and indicates how difficult it is to confine/extinguish an explosion within equipment. This, in turn, defines the requirements that electrical apparatus intended for use in an explosive atmosphere must meet.
| Gas/Vapour Group | |
| Group IIA |
Reference gas: propane
MESG ≥ 0.9 mm (Maximum Experimental Safe Gap) MIE ≈ 260 µJ (Minimum Ignition Energy; higher values → less demanding) |
| Group IIB |
Reference gas: ethylene
MESG 0.5–0.9 mm MIE ≈ 70 µJ (intermediate) |
| Group IIC |
Reference gases: hydrogen and acetylene
MESG ≤ 0.5 mm MIE ≈ 17 µJ (lowest → most demanding) |
The temperature class indicates the maximum surface temperature permitted for electrical equipment in service, thereby preventing self-ignition due to heat in an explosive atmosphere.
| Class | Maximum permitted surface temperature |
| T1 (the least restrictive parameter) | ≤ 450 °C |
| T2 | ≤ 300 °C |
| T3 | ≤ 200 °C |
| T4 | ≤ 135 °C |
| T5 | ≤ 100 °C |
| T6 (the most restrictive parameter) | ≤ 85 °C |
The autoignition temperature is the minimum temperature at which a substance ignites spontaneously in air without the need for a spark, flame, or external ignition source.
The flash point is the minimum temperature at which a flammable liquid gives off vapours in sufficient quantity to form, with air, a mixture that can ignite in the presence of an external ignition source (spark, flame, hot surface, etc.).
The initial boiling point is the lowest temperature at which a flammable liquid or liquid mixture begins to boil.
The relative density of a gas or vapour indicates how many times heavier or lighter it is than air, taking the density of air under normal conditions as the reference.
The minimum concentration of a flammable gas or vapour in air, expressed as % by volume, below which the mixture is not flammable or explosive because there is too little fuel for combustion to be sustained.
The maximum concentration of a flammable gas or vapour in air, expressed as % by volume, above which the mixture does not explode because there is excess fuel and insufficient oxygen to sustain combustion.
| Substance | Formula | ATEX Group | Temp. Class | Autoignition Temp (°C) | Flash Point (°C) | Initial Boiling Point (°C) | Relative Density (air=1) | LEL (%) | UEL (%) | Notes |
|---|---|---|---|---|---|---|---|---|---|---|
| 1,2-Dichloroethane | ClCH₂CH₂Cl | IIA | T1 | 460 | 2 | 48 | 3.3 | 6.2 | 16 | Vapours heavier than air (pooling in low-lying areas). Moderate/high LEL. Flash point bajo (≤23°C). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. | Vapours heavier than air (pooling in low-lying areas). Flash point bajo (≤23°C). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. |
| 1,2-Dichloropropane | C₃H₆Cl₂ | IIA | T1 | 555 | 15 | 96 | 3.9 | 3.4 | 14.5 | Vapours heavier than air (pooling in low-lying areas). Moderate/high LEL. Flash point bajo (≤23°C). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. | Vapours heavier than air (pooling in low-lying areas). Flash point bajo (≤23°C). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. |
| 1-Hexene | C₆H₁₂ | IIA | T2 | 223 | -26 | 63 | 2.9 | 1.1 | 7.5 | Olefinas; reactividad al oxígeno/superficies. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C. Low autoignition (≤250 °C). Grupo IIA (lower relative hazard). Clase de temperatura T2. |
| 1-Nitropropane | C₃H₇NO₂ | IIB | T2 | 420 | 49 | 131 | 3 | 2.2 | — | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Flash point moderado (≤60°C). Autoignition temperature alta (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Flash point moderado (≤60°C). High autoignition (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. Riesgo de descomposición violenta bajo choque/calor. |
| 1-Pentene | C₅H₁₀ | IIA | T1 | 385 | -51 | 30 | 2.5 | 1.1 | 7.7 | Olefinas; polymerises en presencia de radicales. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C. High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. Highly volatile at 20–25 °C. |
| 2-Butoxyethanol (Butyl Cellosolve) | C₆H₁₄O₂ | IIA | T2 | 238 | 60 | 171 | 4.1 | 1.1 | 10.6 | Éter glicólico; absorción dérmica. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). Low autoignition (≤250 °C). Grupo IIA (lower relative hazard). Clase de temperatura T2. Low volatility (high boiling point). |
| 2-Chloroethanol (Ethylene chlorohydrin) | ClCH₂CH₂OH | IIA | T2 | 425 | 60 | 129 | 2.8 | 5 | 16 | Vapours heavier than air (pooling in low-lying areas). Moderate/high LEL. Flash point moderado (≤60°C). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. | Vapours heavier than air (pooling in low-lying areas). Flash point moderado (≤60°C). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. |
| 2-Ethoxyethanol (EGME) | C₂H₅OCH₂CH₂OH | IIA | T3 | 235 | 40 | 135 | 3.1 | 1.7 | 15.7 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). Autoignition temperature baja (≤250 °C). Grupo IIA (lower relative hazard). Clase de temperatura T3. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). Low autoignition (≤250 °C). Grupo IIA (lower relative hazard). Clase de temperatura T3. |
| 2-Methylpentane (isohexane) | C₆H₁₄ | IIA | T2 | 300 | -7 | 60 | 3 | 1.2 | 7 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature media (≤350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C. Medium autoignition (≤350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. |
| 2-Methoxyethanol (ME) | C₃H₈O₂ | IIA | T2 | 238 | 39 | 124 | 2.1 | 1.4 | 14 | Éter glicólico; toxic reproductivo. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). Low autoignition (≤250 °C). Grupo IIA (lower relative hazard). Clase de temperatura T2. |
| Acetaldehyde | C₂H₄O | IIA | T1 | 175 | -39 | 20.2 | 1.52 | 4 | 60 | Muy reactivo; polymerises | Vapours heavier than air (pooling in low-lying areas). Moderate/high LEL. Wide flammability range (LEL–UEL). Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature baja (≤250 °C). Grupo IIA (lower relative hazard). Clase de temperatura T1. Highly volatile at ambient temperature. | Vapours heavier than air (pooling in low-lying areas). Wide flammability range (LEL–UEL). Flash point ≤ 0 °C. Low autoignition (≤250 °C). Grupo IIA (lower relative hazard). Clase de temperatura T1. Highly volatile at 20–25 °C. |
| Ethyl acetate | C₄H₈O₂ | IIB | T2 | 366 | 11 | 101 | 3 | 1.9 | 22.5 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Wide flammability range. Flash point bajo (≤23°C). Autoignition temperature alta (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Wide flammability range. Flash point bajo (≤23°C). High autoignition (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. |
| Isopropyl acetate | C₅H₁₀O₂ | IIA | T1 | 460 | 4 | 89 | 3.5 | 1.8 | 8 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point bajo (≤23°C). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point bajo (≤23°C). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. |
| Methyl acetate | C₃H₆O₂ | IIA | T2 | 455 | -10 | 57 | 2.5 | 3.1 | 16 | Solvente inflamable | Vapours heavier than air (pooling in low-lying areas). Moderate/high LEL. Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. | Vapours heavier than air (pooling in low-lying areas). Flash point ≤ 0 °C. High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. |
| n-Butyl acetate | C₆H₁₂O₂ | IIA | T2 | 370 | 22 | 127 | 4 | 1.2 | 7.6 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point bajo (≤23°C). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point bajo (≤23°C). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. |
| Vinyl acetate | C₄H₆O₂ | IIA | T2 | 427 | -8 | 72 | 3 | 2.6 | 13.4 | Monómero inflamable; polymerises | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Flash point ≤ 0 °C. High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. |
| Acetylene | C₂H₂ | IIC | T2 | 305 | No aplica (gas) | No aplica (gas) | 0.899 | 2.5 | 81 | Inestabilidad a presión; no usar cobre puro | Vapour density similar to air. Low LEL (≤3% v/v). Wide flammability range (LEL–UEL). Gas: flash point not applicable. Autoignition temperature media (≤350°C). Grupo IIC (maximum ATEX design stringency). Clase de temperatura T2. | Low LEL (≤3% v/v). Wide flammability range (LEL–UEL). Gas: flash point not applicable. Medium autoignition (≤350°C). Grupo IIC (maximum stringency). Clase de temperatura T2. |
| Acetone | C₃H₆O | IIB | T2 | 405 | 21 | 97 | 2 | 2.5 | 28 | Muy toxic; corrosive | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Wide flammability range. Flash point bajo (≤23°C). Autoignition temperature alta (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Wide flammability range. Flash point bajo (≤23°C). High autoignition (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. |
| Acetonitrile | C₂H₃N | IIA | T1 | 524 | 2 | 82 | 1.4 | 4.4 | 16 | Nitrilo polar; toxic | Vapours heavier than air (pooling in low-lying areas). Moderate/high LEL. Flash point bajo (≤23°C). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. | Vapours heavier than air (pooling in low-lying areas). Flash point bajo (≤23°C). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. |
| Acetic acid | CH₃COOH | IIA | T1 | 485 | 40 | 118 | 2.1 | 4 | 17 | Vapours heavier than air (pooling in low-lying areas). Moderate/high LEL. Flash point moderado (≤60°C). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. | Vapours heavier than air (pooling in low-lying areas). Flash point moderado (≤60°C). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. |
| Acrylic acid | C₃H₄O₂ | IIB | T2 | 400 | 54 | 141 | 2 | 2.8 | 8 | Polimeriza; inhibidores requeridos | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Flash point moderado (≤60°C). Autoignition temperature alta (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Flash point moderado (≤60°C). High autoignition (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. |
| Formic acid | HCOOH | IIA | T1 | 520 | 65 | 101 | 1.6 | 18 | 57 | Vapours heavier than air (pooling in low-lying areas). Moderate/high LEL. Wide flammability range (LEL–UEL). Flash point >60°C. Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. | Vapours heavier than air (pooling in low-lying areas). Wide flammability range (LEL–UEL). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. |
| Ethyl acrylate | C₅H₈O₂ | IIB | T2 | 390 | 9 | 99 | 3 | 2 | 11 | Acrylic monomer; strong odour | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point bajo (≤23°C). Autoignition temperature alta (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point bajo (≤23°C). High autoignition (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. Reactive monomer; polymerises; requires inhibitors and temperature control. |
| n-Butyl acrylate | C₇H₁₂O₂ | IIA | T2 | 333 | 27 | 146 | 4 | 1 | 8 | Acrylic monomer; pungent odour | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). Autoignition temperature media (≤350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). Medium autoignition (≤350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. Reactive monomer; polymerises; requires inhibitors and temperature control. |
| Acrylic (Acrylic acid) | C₃H₄O₂ | IIB | T2 | 400 | 54 | 141 | 2 | 2.8 | 8 | Reactive monomer; polymerises; requires inhibitors. |
| Acrylonitrile (Nitrile) | C₃H₃N | IIA | T1 | 481 | -5 | 77 | 1.8 | 3 | 17 | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Flash point ≤ 0 °C. High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. |
| Acrolein | C₃H₄O | IIB | T2 | 220 | -26 | 52 | 1.9 | 2.8 | 31 | Muy tóxica e irritante; polymerises. | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Wide flammability range. Flash point ≤ 0 °C. Low autoignition (≤250 °C). Grupo IIB (intermediate hazard). Clase de temperatura T2. Reactive monomer; polymerises; requires inhibitors and temperature control. |
| Ethyl alcohol (Ethanol) | C₂H₅OH | IIA | T2 | 425 | 12 | 78 | 1.6 | 3.3 | 19 | Vapours heavier than air (pooling in low-lying areas). Moderate/high LEL. Flash point bajo (≤23°C). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. | Vapours heavier than air (pooling in low-lying areas). Flash point bajo (≤23°C). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. |
| Isopropyl alcohol (Isopropanol) | (CH₃)₂CHOH | IIA | T2 | 399 | 11 | 82 | 2.1 | 2 | 12 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point bajo (≤23°C). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point bajo (≤23°C). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. |
| Methyl alcohol (Methanol) | CH₃OH | IIA | T2 | 470 | 11 | 64.7 | 1.11 | 6.7 | 36 | Invisible flame; toxic | Vapour density similar to air. Moderate/high LEL. Wide flammability range. Flash point bajo (≤23°C). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. | Wide flammability range. Flash point bajo (≤23°C). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. Toxic sistémico (riesgo visual/neurológico). |
| n-Butyl alcohol (1-butanol) | C₄H₉OH | IIA | T2 | 340 | 29 | 118 | 2.5 | 1.4 | 11.3 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). Autoignition temperature media (≤350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). Medium autoignition (≤350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. |
| sec-Butanol (2-butanol) | C₄H₁₀O | IIA | T2 | 415 | 24 | 99 | 2.6 | 1.4 | 11.2 | Isómero del butanol; inflamable | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. |
| Allylamine | C₃H₇N | IIB | T3 | 385 | -20 | 55 | 2.1 | 1.8 | 14 | Amine; muy irritante | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature alta (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T3. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C. High autoignition (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T3. |
| Ammonia | NH₃ | IIA | T1 | 651 | No aplica (gas) | No aplica (gas) | 0.59 | 15 | 28 | Corrosive; irritante | Lighter than air (tends to rise). Moderate/high LEL. Gas: flash point not applicable. Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. | Lighter than air (tends to rise). Gas: flash point not applicable. High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. Gas alcalino/corrosive; reacciona con ácidos. |
| Acetic anhydride | (CH₃CO)₂O | IIA | T2 | 334 | 49 | 140 | 3.5 | 2 | 10.3 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). Autoignition temperature media (≤350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). Medium autoignition (≤350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. |
| Phthalic anhydride | C₆H₄(CO)₂O | IIA | T1 | 580 | 152 | 285 | 5.1 | 1.7 | 10.5 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point >60°C. Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. Low volatility (high boiling point). | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. Low volatility (high boiling point). |
| Maleic anhydride | C₄H₂O₃ | IIB | T1 | 475 | 102 | 202 | 3.4 | 1.4 | 7.1 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point >60°C. Autoignition temperature alta (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T1. Low volatility (high boiling point). | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). High autoignition (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T1. Low volatility (high boiling point). |
| Aniline | C₆H₅NH₂ | IIA | T1 | 615 | 70 | 184 | 3.2 | 1.3 | — | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point >60°C. Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. Low volatility (high boiling point). | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. Low volatility (high boiling point). |
| Anthracene | C₁₄H₁₀ | IIA | T1 | 540 | 121 | 340 | 6.1 | 0.6 | — | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point >60°C. Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. Low volatility (high boiling point). | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. Low volatility (high boiling point). |
| Benzene | C₆H₆ | IIA | T1 | 562 | -11 | 80.1 | 2.6969 | 1.35 | 6.65 | Carcinogenic | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C. High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. Carcinogenic (A1); exposición mínima. |
| Butadiene | C₄H₆ | IIB | T2 | 420 | -7 | -4 | 1.9 | 2 | 12.5 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature alta (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. Highly volatile at ambient temperature. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C. High autoignition (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. Highly volatile at 20–25 °C. |
| n-Butane | C₄H₁₀ | IIA | T2 | 405 | No aplica (gas) | No aplica (gas) | 2.0061 | 1.86 | 8.41 | Líquido a presión; vapores pesados | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Gas: flash point not applicable. Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Gas: flash point not applicable. High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. |
| Butene (mixture) | C₄H₈ | IIA | T2 | 385 | -80 | -6 | 1.9 | 1.6 | 10 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. Highly volatile at ambient temperature. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C. High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. Highly volatile at 20–25 °C. |
| n-Butylamine | C₄H₁₁N | IIB | T1 | 345 | -12 | 78 | 2 | 1.4 | 9.8 | Amine; strong odour; corrosiva. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C. Medium autoignition (≤350°C). Grupo IIB (intermediate hazard). Clase de temperatura T1. |
| Hydrogen cyanide (HCN) | HCN | IIB | T1 | 538 | -18 | 26 | 0.94 | 5.6 | 40 | Muy toxic; inflamable. | Wide flammability range (LEL–UEL). Flash point ≤ 0 °C. High autoignition (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T1. Highly volatile at 20–25 °C. Severe toxicity; strict containment measures. |
| Cyclohexane | C₆H₁₂ | IIA | T3 | 210 | -20 | 71 | 2.9 | 1.2 | 7.7 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature baja (≤250 °C). Grupo IIA (lower relative hazard). Clase de temperatura T3. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C. Low autoignition (≤250 °C). Grupo IIA (lower relative hazard). Clase de temperatura T3. |
| Cyclohexanone | C₆H₁₀O | IIA | T1 | 420 | 44 | 156 | 2.7 | 1.1 | 9.4 | Ketone; irritante; vapores pesados. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. Low volatility (high boiling point). |
| Cyclopentane | C₅H₁₀ | IIA | T2 | 380 | -37 | 49 | 2.4 | 1.4 | 8.7 | Hidrocarburo cíclico; vapores pesados | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C. High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. |
| Chlorobenzene | C₆H₅Cl | IIA | T1 | 640 | 29 | 132 | 3.9 | 1.3 | 7 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. |
| Chloroethane (Ethyl chloride) | C₂H₅Cl | IIA | T1 | 510 | -50 | 12 | 2.2 | 3.8 | 15.4 | Vapours heavier than air (pooling in low-lying areas). Moderate/high LEL. Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. Highly volatile at ambient temperature. | Vapours heavier than air (pooling in low-lying areas). Flash point ≤ 0 °C. High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. Highly volatile at 20–25 °C. |
| Allyl chloride | C₃H₅Cl | IIA | T1 | 440 | -28 | 45 | 2.3 | 3.6 | 11 | Toxic; lacrimógeno; muy inflamable. | Vapours heavier than air (pooling in low-lying areas). Flash point ≤ 0 °C. High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. |
| Methyl chloride (Chloromethane) | CH₃Cl | IIA | T1 | 625 | — | -24 | 1.8 | 7.1 | 18.5 | Vapours heavier than air (pooling in low-lying areas). Moderate/high LEL. Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. Highly volatile at ambient temperature. | Vapours heavier than air (pooling in low-lying areas). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. Highly volatile at 20–25 °C. |
| n-Butyl chloride | C₄H₉Cl | IIA | T1 | 460 | -10 | 78 | 3.2 | 1.8 | 10.1 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C. High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. |
| Propyl chloride (1-chloropropane) | C₃H₇Cl | IIA | T1 | 520 | -20 | 47 | 2.7 | 2.6 | 11.1 | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Flash point ≤ 0 °C. High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. |
| Vinylidene chloride (1,1-dichloroethene) | C₂H₂Cl₂ | IIA | T2 | 440 | -20 | 32 | 3.3 | 5.6 | 16 | Vapours heavier than air (pooling in low-lying areas). Moderate/high LEL. Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. Highly volatile at ambient temperature. | Vapours heavier than air (pooling in low-lying areas). Flash point ≤ 0 °C. High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. Highly volatile at 20–25 °C. |
| Vinyl chloride | C₂H₃Cl | IIA | T2 | 472 | -78 | -13.4 | 2.16 | 4 | 22 | Carcinogenic; used in PVC | Vapours heavier than air (pooling in low-lying areas). Moderate/high LEL. Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. Highly volatile at ambient temperature. | Vapours heavier than air (pooling in low-lying areas). Flash point ≤ 0 °C. High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. Highly volatile at 20–25 °C. Carcinogenic; liquefied gas muy inflamable. |
| Crotonaldehyde | C₄H₆O | IIB | T2 | 210 | 6 | 104 | 2.5 | 2.1 | 15.2 | Aldehyde; irritante; polymerises. | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Flash point bajo (≤23°C). Low autoignition (≤250 °C). Grupo IIB (intermediate hazard). Clase de temperatura T2. |
| Cumene (Isopropylbenzene) | C₆H₅CH(CH₃)₂ | IIA | T2 | 420 | 37 | 152 | 4.1 | 0.8 | 6 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. Low volatility (high boiling point). | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. Low volatility (high boiling point). |
| Diethyl ether (Ethyl ether) | (C₂H₅)₂O | IIB | T4 | 170 | -45 | 34 | 2.5 | 1.9 | 45 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Wide flammability range (LEL–UEL). Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature baja (≤250 °C). Grupo IIB (intermediate hazard). Clase de temperatura T4. Highly volatile at ambient temperature. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Wide flammability range (LEL–UEL). Flash point ≤ 0 °C. Low autoignition (≤250 °C). Grupo IIB (intermediate hazard). Clase de temperatura T4. Highly volatile at 20–25 °C. Forms peroxides in storage (monitor inhibitors and shelf life). |
| Diethylamine | C₂H₅NH₂ | IIA | T2 | 310 | -30 | 56 | 2.5 | 1.7 | 10.1 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature media (≤350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C. Medium autoignition (≤350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. |
| Dimethyl ether | C₂H₆O | IIA | T2 | 350 | -41 | -24 | 1.59 | 3.4 | 27 | Gas licuado, usado como propelente | Vapours heavier than air (pooling in low-lying areas). Moderate/high LEL. Wide flammability range. Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature media (≤350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. Highly volatile at ambient temperature. | Vapours heavier than air (pooling in low-lying areas). Wide flammability range. Flash point ≤ 0 °C. Medium autoignition (≤350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. Highly volatile at 20–25 °C. Forms peroxides in storage (monitor inhibitors and shelf life). |
| Dimethyl sulfoxide (DMSO) | (CH₃)₂SO | IIA | T3 | 270 | 95 | 189 | 2.7 | 2.6 | 28.5 | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Wide flammability range. Flash point >60°C. Autoignition temperature media (≤350°C). Grupo IIA (lower relative hazard). Clase de temperatura T3. Low volatility (high boiling point). | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Wide flammability range. Medium autoignition (≤350°C). Grupo IIA (lower relative hazard). Clase de temperatura T3. Low volatility (high boiling point). |
| Dimethylamine | C₂H₇N | IIB | T3 | 385 | -18 | 16.6 | 1.59 | 2.7 | 14 | Amine inflamable; vapores pesados | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature alta (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T3. Highly volatile at ambient temperature. | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Flash point ≤ 0 °C. High autoignition (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T3. Highly volatile at 20–25 °C. |
| Dimethylformamide (DMF) | HCON(CH₃)₂ | IIA | T2 | 440 | 58 | 155 | 2.5 | 2.2 | 16 | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Flash point moderado (≤60°C). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. Low volatility (high boiling point). | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Flash point moderado (≤60°C). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. Low volatility (high boiling point). |
| Di-n-butyl ether | (C₄H₉)₂O | IIA | T4 | 185 | 25 | 141 | 4.5 | 0.9 | 8.5 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). Autoignition temperature baja (≤250 °C). Grupo IIA (lower relative hazard). Clase de temperatura T4. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). Low autoignition (≤250 °C). Grupo IIA (lower relative hazard). Clase de temperatura T4. Forms peroxides in storage (monitor inhibitors and shelf life). |
| Carbon disulfide | CS₂ | IIC | T6 | 95 | -30 | 46 | 2.264 | 1.3 | 50 | Muy baja temp. de ignición; vapores muy pesados | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Wide flammability range (LEL–UEL). Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature baja (≤250 °C). Grupo IIC (maximum ATEX design stringency). Clase de temperatura T6. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Wide flammability range (LEL–UEL). Flash point ≤ 0 °C. Low autoignition (≤250 °C). Grupo IIC (maximum stringency). Clase de temperatura T6. |
| Styrene | C₈H₈ | IIA | T2 | 490 | 31 | 145 | 3.59 | 1.1 | 6.1 | Polimeriza fácilmente | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. Polimeriza; usar inhibidores y control de temperatura. |
| Ethane | C₂H₆ | IIA | T1 | 515 | No aplica (gas) | No aplica (gas) | 1.0378 | 3 | 12.4 | Alcano ligero | Vapour density similar to air. Low LEL (≤3% v/v). Gas: flash point not applicable. Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. | Low LEL (≤3% v/v). Gas: flash point not applicable. High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. |
| ETBE (Ethyl tert-butyl ether) | C₆H₁₄O | IIA | T1 | 415 | -20 | 73 | 3 | 1.5 | 8.5 | Éter combustible; gasoline additive. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C. High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. Forms peroxides in storage (monitor inhibitors and shelf life). |
| Ethanethiol | C₂H₆S | IIB | T2 | 285 | -45 | 35 | 2.1 | 3.8 | 18.2 | Thiol; olor muy intenso; corrosive. | Vapours heavier than air (pooling in low-lying areas). Flash point ≤ 0 °C. Medium autoignition (≤350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. Highly volatile at 20–25 °C. |
| Diethyl ether | C₂H₅OC₂H₅ | IIB | T4 | 160 | -45 | 34.6 | 2.586 | 1.9 | 36 | Forma peróxidos; muy baja T de ignición | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Wide flammability range (LEL–UEL). Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature baja (≤250 °C). Grupo IIB (intermediate hazard). Clase de temperatura T4. Highly volatile at ambient temperature. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Wide flammability range (LEL–UEL). Flash point ≤ 0 °C. Low autoignition (≤250 °C). Grupo IIB (intermediate hazard). Clase de temperatura T4. Highly volatile at 20–25 °C. Forms peroxides in storage (monitor inhibitors and shelf life). |
| Diisopropyl ether (DIPE) | C₆H₁₄O | IIA | T1 | 443 | -28 | 69 | 3 | 1.4 | 22.8 | Forma peróxidos; altamente inflamable | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Wide flammability range. Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Wide flammability range. Flash point ≤ 0 °C. High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. Forms peroxides in storage (monitor inhibitors and shelf life). |
| Ethyl methyl ether | CH₃OC₂H₅ | IIB | T4 | 190 | -37 | 8 | 2 | 2 | 10.1 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature baja (≤250 °C). Grupo IIB (intermediate hazard). Clase de temperatura T4. Highly volatile at ambient temperature. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C. Low autoignition (≤250 °C). Grupo IIB (intermediate hazard). Clase de temperatura T4. Highly volatile at 20–25 °C. |
| Vinyl ether | (H₂C=CH)₂O | IIB | T2 | 360 | -30 | 39 | 2.4 | 1.7 | 27 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Wide flammability range. Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature alta (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Wide flammability range. Flash point ≤ 0 °C. High autoignition (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. Forms peroxides in storage (monitor inhibitors and shelf life). |
| Ethyl butyrate | C₆H₁₂O₂ | IIA | T1 | 425 | 24 | 120.5 | 3 | 1.7 | 8.2 | Éster; aroma; vapores pesados. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. |
| Ethyl formate | C₃H₆O₂ | IIA | T1 | 425 | -20 | 54 | 2 | 2.8 | 16 | Éster; olor afrutado; inflamable. | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Flash point ≤ 0 °C. High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. |
| Ethylbenzene | C₆H₅C₂H₅ | IIA | T2 | 431 | 15 | 136 | 3.6 | 1 | 6.7 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point bajo (≤23°C). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point bajo (≤23°C). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. Carcinogenic (A1); exposición mínima. |
| Ethylcyclohexane | C₈H₁₆ | IIA | T3 | 260 | 21 | 132 | 3.8 | 0.9 | 6.6 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point bajo (≤23°C). Autoignition temperature media (≤350°C). Grupo IIA (lower relative hazard). Clase de temperatura T3. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point bajo (≤23°C). Medium autoignition (≤350°C). Grupo IIA (lower relative hazard). Clase de temperatura T3. |
| Ethylcyclopentane | C₇H₁₄ | IIA | T3 | 260 | 21 | 103 | 3.4 | 1.1 | 6.7 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point bajo (≤23°C). Autoignition temperature media (≤350°C). Grupo IIA (lower relative hazard). Clase de temperatura T3. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point bajo (≤23°C). Medium autoignition (≤350°C). Grupo IIA (lower relative hazard). Clase de temperatura T3. |
| Ethylenediamine | C₂H₈N₂ | IIB | T1 | 385 | 34 | 116 | 2.1 | 2.7 | 14.8 | Amine; sensibilizante; corrosiva. | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Flash point moderado (≤60°C). High autoignition (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T1. |
| Ethylene glycol | HOCH₂CH₂OH | IIB | T2 | 410 | 111 | 197 | 2.1 | 3.2 | — | Vapours heavier than air (pooling in low-lying areas). Moderate/high LEL. Flash point >60°C. Autoignition temperature alta (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. Low volatility (high boiling point). | Vapours heavier than air (pooling in low-lying areas). High autoignition (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. Low volatility (high boiling point). |
| Ethyleneimine (Aziridine) | C₂H₅N | IIB | T2 | 320 | -13 | 55 | — | 3.6 | 46 | Moderate/high LEL. Wide flammability range (LEL–UEL). Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature media (≤350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. | Wide flammability range (LEL–UEL). Flash point ≤ 0 °C. Medium autoignition (≤350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. |
| Ethylene | C₂H₄ | IIB | T2 | 490 | No aplica (gas) | No aplica (gas) | 0.9686 | 2.75 | 28.6 | Representative gas IIB | Vapour density similar to air. Low LEL (≤3% v/v). Wide flammability range. Gas: flash point not applicable. Autoignition temperature alta (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. | Low LEL (≤3% v/v). Wide flammability range. Gas: flash point not applicable. High autoignition (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. |
| Formaldehyde | CH₂O | IIB | T2 | 430 | -92 | -19 | 1.067 | 7 | 73 | Muy toxic; gas soluble en agua | Vapour density similar to air. Moderate/high LEL. Wide flammability range (LEL–UEL). Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature alta (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. Highly volatile at ambient temperature. | Wide flammability range (LEL–UEL). Flash point ≤ 0 °C. High autoignition (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. Highly volatile at 20–25 °C. |
| Phosphine | PH₃ | IIC | — | — | — | -88 | 1.2 | 1.8 | 98 | Pirofórica; extremadamente peligrosa. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Wide flammability range (LEL–UEL). Grupo IIC (maximum stringency). Highly volatile at 20–25 °C. Pyrophoric: ignición espontánea en aire. |
| Furan | C₄H₄O | IIB | — | — | -20 | 32 | 2.3 | 2.3 | 14.3 | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Flash point ≤ 0 °C (easy ignition at low T). Grupo IIB (intermediate hazard). Highly volatile at ambient temperature. | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Flash point ≤ 0 °C. Grupo IIB (intermediate hazard). Highly volatile at 20–25 °C. |
| Furfural | C₄H₃OCHO | IIB | T2 | 315 | 60 | 162 | 3.3 | 2.1 | 19.3 | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Flash point moderado (≤60°C). Autoignition temperature media (≤350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. Low volatility (high boiling point). | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Flash point moderado (≤60°C). Medium autoignition (≤350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. Low volatility (high boiling point). |
| Town gas (H₂/CO/CH₄ mixture) | Mezcla | IIC | T1 | — | No aplica (gas/mezcla) | No aplica (mezcla de gases) | — | — | — | Mezcla variable (H2/CO/CH4); apply the most demanding component (H₂ → IIC). LIE/LSE dependen de composición (Le Chatelier’s rule). |
| Diesel fuel (light diesel) | Mezcla | IIA | T3 | 232 | 27 | 220 | 1.1 | 0.8 | 3.7 | Indicative values (mixture) | Vapour density similar to air. Very low LEL (≤2% v/v). Flash point moderado (≤60°C). Autoignition temperature baja (≤250 °C). Grupo IIA (lower relative hazard). Clase de temperatura T3. Low volatility (high boiling point). | Very low LEL (≤2% v/v). Flash point moderado (≤60°C). Low autoignition (≤250 °C). Grupo IIA (lower relative hazard). Clase de temperatura T3. Low volatility (high boiling point). |
| Gasolines (mixture) | Mezcla | IIA | T3 | 390 | -45 | 40 | 3 | 1.6 | 6 | — |
| Ethylene glycol | HOCH₂CH₂OH | IIB | T2 | 410 | 111 | 197 | 2.1 | 3.2 | — | — |
| n-Heptane | C₇H₁₆ | IIA | T1 | 223 | -4 | 98.4 | 3.4596 | 1 | 6 | Hidrocarburo alifático | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature baja (≤250 °C). Grupo IIA (lower relative hazard). Clase de temperatura T1. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C. Low autoignition (≤250 °C). Grupo IIA (lower relative hazard). Clase de temperatura T1. |
| Hexane | C₆H₁₄ | IIA | T2 | 300 | -7 | 60 | 3 | 1.2 | 7 | — |
| Hydrazine | N₂H₄ | IIB | T3 | 270 | 74 | 114 | 1.11 | 4.7 | 100 | Líquido toxic; propelente de cohetes | Vapour density similar to air. Moderate/high LEL. Wide flammability range (LEL–UEL). Flash point >60°C. Autoignition temperature media (≤350°C). Grupo IIB (intermediate hazard). Clase de temperatura T3. | Wide flammability range (LEL–UEL). Medium autoignition (≤350°C). Grupo IIB (intermediate hazard). Clase de temperatura T3. Severe toxicity; strict containment measures. |
| Hydrogen | H₂ | IIC | T1 | 500 | No aplica (gas) | No aplica (gas) | 0.0696 | 4 | 75 | Amplio rango explosivo; energía de ignición muy baja | Lighter than air (tends to rise). Moderate/high LEL. Wide flammability range (LEL–UEL). Gas: flash point not applicable. Autoignition temperature alta (>350°C). Grupo IIC (maximum ATEX design stringency). Clase de temperatura T1. | Lighter than air (tends to rise). Wide flammability range (LEL–UEL). Gas: flash point not applicable. High autoignition (>350°C). Grupo IIC (maximum stringency). Clase de temperatura T1. |
| Isobutyl acetate | C₆H₁₂O₂ | IIA | T1 | 460 | 18 | 118 | 3 | 1.3 | 7.5 | Éster; olor afrutado; combustible. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point bajo (≤23°C). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. |
| Isobutyraldehyde | C₄H₈O | IIA | T1 | 415 | -13 | 63 | 2 | 1.7 | 10.6 | Aldehyde ramificado; volátil. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C. High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. |
| Isopentane (2-methylbutane) | C₅H₁₂ | IIA | T1 | 420 | -51 | 28 | 2.48 | 1.4 | 7.6 | Muy volátil; vapores pesados. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C. High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. Highly volatile at 20–25 °C. |
| Isoprene | C₅H₈ | IIB | T3 | 220 | -54 | 34 | 2.3 | 1 | 9.7 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature baja (≤250 °C). Grupo IIB (intermediate hazard). Clase de temperatura T3. Highly volatile at ambient temperature. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C. Low autoignition (≤250 °C). Grupo IIB (intermediate hazard). Clase de temperatura T3. Highly volatile at 20–25 °C. |
| Isopropanol (Isopropyl alcohol) | C₃H₈O | IIA | T2 | 399 | 12 | 82.5 | 2.07 | 2 | 12 | Aerosoles inflamables | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point bajo (≤23°C). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point bajo (≤23°C). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. |
| Kerosene | – | IIA | T3 | 210 | 38 | 175 | 4.5 | 0.7 | 5 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). Autoignition temperature baja (≤250 °C). Grupo IIA (lower relative hazard). Clase de temperatura T3. Low volatility (high boiling point). | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). Low autoignition (≤250 °C). Grupo IIA (lower relative hazard). Clase de temperatura T3. Low volatility (high boiling point). |
| MEK (Methyl ethyl ketone) | C₄H₈O | IIB | T2 | 321 | -17 | 66 | 2.5 | 1.5 | 12 | Forma peróxidos; common solvent | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature media (≤350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C. Medium autoignition (≤350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. |
| Mesitylene (1,3,5-trimethylbenzene) | C₉H₁₂ | IIA | T1 | 559 | 44 | 165 | 4.2 | 0.9 | 6.4 | Aromático; densidad de vapor alta. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. Low volatility (high boiling point). |
| Methane (natural gas) | CH₄ | IIA | T1 | 580 | No aplica (gas) | No aplica (gas) | 0.5537 | 5 | 15 | Gas más ligero que el aire | Lighter than air (tends to rise). Moderate/high LEL. Gas: flash point not applicable. Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. | Lighter than air (tends to rise). Gas: flash point not applicable. High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. |
| Methanethiol (Methyl mercaptan) | CH₄S | IIB | T2 | 260 | — | 6 | 1.1 | 3.9 | 21.8 | Gas; tiol; olor muy penetrante. | Medium autoignition (≤350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. Highly volatile at 20–25 °C. |
| Methyl formate | C₂H₄O₂ | IIA | T1 | 455 | -19 | 32 | 1.5 | 5 | 26 | Éster; muy volátil. | Vapours heavier than air (pooling in low-lying areas). Wide flammability range. Flash point ≤ 0 °C. High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. Highly volatile at 20–25 °C. |
| Methylamine | CH₃NH₂ | IIA | T2 | 430 | — | -6 | 1.07 | 5 | 20.7 | Vapour density similar to air. Moderate/high LEL. Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. Highly volatile at ambient temperature. | High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. Highly volatile at 20–25 °C. |
| Methyl ethyl ketone (MEK) | CH₃COC₂H₅ | IIA | T1 | 474 | -6 | 80 | 2.5 | 1.8 | 11.5 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C. High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. |
| MIBK (Methyl isobutyl ketone) | C₆H₁₂O | IIA | T1 | 460 | 14 | 116 | 3.4 | 1.2 | 8 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point bajo (≤23°C). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point bajo (≤23°C). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. |
| Carbon monoxide | CO | IIA | T1 | 605 | No aplica (gas) | No aplica (gas) | 0.9667 | 12 | 75 | Toxic; odourless | Vapour density similar to air. Moderate/high LEL. Wide flammability range (LEL–UEL). Gas: flash point not applicable. Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. | Wide flammability range (LEL–UEL). Gas: flash point not applicable. High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. Chemical asphyxiant; incoloro e inodoro. |
| Morpholine | C₄H₉NO | IIB | T2 | 270 | 35 | 128 | 3 | 1.8 | 15 | Amine/éter; corrosiva; miscible en agua. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). Medium autoignition (≤350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. |
| MTBE (Methyl tert-butyl ether) | C₅H₁₂O | IIA | T1 | — | -28 | 55 | 3 | 1.6 | 8.4 | Aditivo gasolina; valor AI a completar | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C (easy ignition at low T). Grupo IIA (lower relative hazard). Clase de temperatura T1. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C. Grupo IIA (lower relative hazard). Clase de temperatura T1. Forms peroxides in storage (monitor inhibitors and shelf life). |
| Naphthalene | C₁₀H₈ | IIA | T1 | 526 | 79 | 218 | 4.4 | 0.9 | 5.9 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point >60°C. Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. Low volatility (high boiling point). | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. Low volatility (high boiling point). |
| n-Decane | C₁₀H₂₂ | IIA | T3 | 205 | 43 | 174 | 4.9 | 0.7 | 5.4 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). Autoignition temperature baja (≤250 °C). Grupo IIA (lower relative hazard). Clase de temperatura T3. Low volatility (high boiling point). | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). Low autoignition (≤250 °C). Grupo IIA (lower relative hazard). Clase de temperatura T3. Low volatility (high boiling point). |
| n-Dodecane | C₁₂H₂₆ | IIA | T3 | 200 | 75 | 216 | 5.8 | 0.6 | — | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point >60°C. Autoignition temperature baja (≤250 °C). Grupo IIA (lower relative hazard). Clase de temperatura T3. Low volatility (high boiling point). | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Low autoignition (≤250 °C). Grupo IIA (lower relative hazard). Clase de temperatura T3. Low volatility (high boiling point). |
| Neopentane (2,2-dimethylpropane) | C₅H₁₂ | IIA | T1 | 450 | -49 | 9.5 | 2.48 | 1.4 | 7.7 | Muy volátil; vapores pesados. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C. High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. Highly volatile at 20–25 °C. |
| Nicotine | C₁₀H₁₄N₂ | IIA | T3 | 240 | — | 246 | 5.6 | 0.7 | 4 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Autoignition temperature baja (≤250 °C). Grupo IIA (lower relative hazard). Clase de temperatura T3. Low volatility (high boiling point). | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Low autoignition (≤250 °C). Grupo IIA (lower relative hazard). Clase de temperatura T3. Low volatility (high boiling point). |
| Nitroethane | C₂H₅NO₂ | IIA | T2 | 414 | 28 | 115 | 2.6 | 3.4 | — | Vapours heavier than air (pooling in low-lying areas). Moderate/high LEL. Flash point moderado (≤60°C). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. | Vapours heavier than air (pooling in low-lying areas). Flash point moderado (≤60°C). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. Riesgo de descomposición violenta bajo choque/calor. |
| Nitromethane | CH₃NO₂ | IIA | T2 | 418 | 35 | 101 | 2.1 | 7.3 | — | Vapours heavier than air (pooling in low-lying areas). Moderate/high LEL. Flash point moderado (≤60°C). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. | Vapours heavier than air (pooling in low-lying areas). Flash point moderado (≤60°C). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. Riesgo de descomposición violenta bajo choque/calor. |
| n-Nonane | C₉H₂₀ | IIA | T3 | 205 | 30 | 151 | 4.4 | 0.7 | 5.6 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). Autoignition temperature baja (≤250 °C). Grupo IIA (lower relative hazard). Clase de temperatura T3. Low volatility (high boiling point). | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). Low autoignition (≤250 °C). Grupo IIA (lower relative hazard). Clase de temperatura T3. Low volatility (high boiling point). |
| n-Octane | C₈H₁₈ | IIA | T3 | 210 | 12 | 126 | 3.9 | 0.8 | 6.5 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point bajo (≤23°C). Autoignition temperature baja (≤250 °C). Grupo IIA (lower relative hazard). Clase de temperatura T3. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point bajo (≤23°C). Low autoignition (≤250 °C). Grupo IIA (lower relative hazard). Clase de temperatura T3. |
| n-Propanol (1-propanol) | C₃H₇OH | IIB | T2 | 371 | 15 | 97 | 2.07 | 2.1 | 13.7 | Solvente; vapores pesados | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Flash point bajo (≤23°C). Autoignition temperature alta (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Flash point bajo (≤23°C). High autoignition (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. |
| Ethylene oxide | C₂H₄O | IIC | T2 | 429 | — | 11 | 1.5 | 3 | 100 | Polimeriza/explota; extremadamente reactivo |
| Oxygen | O₂ | IIC | T1 | — | No aplica (gas) | No aplica (gas) | 1.1044 | — | — | No inflamable; oxidiser; no LEL/UEL | Vapour density similar to air. Gas: flash point not applicable. Grupo IIC (maximum ATEX design stringency). Clase de temperatura T1. | Gas: flash point not applicable. Grupo IIC (maximum stringency). Clase de temperatura T1. |
| Paraldehyde | C₆H₁₂O₃ | IIA | T2 | 450 | 42 | 146 | 4.1 | 1.3 | 13 | Solvente fotoresist; electronics | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. |
| n-Pentane | C₅H₁₂ | IIA | T1 | 260 | -49 | 36.1 | 2.4911 | 1.4 | 7.8 | Vapores pesados | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature media (≤350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C. Medium autoignition (≤350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. |
| 2-Pentanone (MPK) | C₅H₁₀O | IIA | T1 | 505 | 7.2 | 102 | 3 | 1.5 | 8.2 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point bajo (≤23°C). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point bajo (≤23°C). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. |
| Piperidine | C₅H₁₁N | IIB | T1 | 320 | -11 | 106 | 2.5 | 1.4 | 10.4 | Amine cíclica; corrosiva. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C. Medium autoignition (≤350°C). Grupo IIB (intermediate hazard). Clase de temperatura T1. |
| Pyridine | C₅H₅N | IIA | T1 | 482 | 17 | 115 | 2.7 | 1.8 | 12.4 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point bajo (≤23°C). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point bajo (≤23°C). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. |
| Propane | C₃H₈ | IIA | T1 | 470 | No aplica (gas) | No aplica (gas) | 1.5219 | 2.1 | 10.1 | LPG; vapores pesados | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Gas: flash point not applicable. Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Gas: flash point not applicable. High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. |
| Propene (Propylene) | C₃H₆ | IIA | T2 | 455 | No aplica (gas) | No aplica (gas) | 1.4529 | 2 | 11.1 | Materia prima petroquímica | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Gas: flash point not applicable. Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Gas: flash point not applicable. High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. |
| n-Propylamine | C₃H₉N | IIB | T1 | 385 | -20 | 49 | 1.7 | 2 | 10.4 | Amine; olor amoniacal; corrosiva. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C. High autoignition (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T1. |
| Propylene glycol | C₃H₈O₂ | IIA | T2 | 420 | 99 | 188 | 2.6 | 2.6 | 12.6 | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Flash point >60°C. Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. Low volatility (high boiling point). | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. Low volatility (high boiling point). |
| Propylene glycol methyl ether (PM / PGME) | C₄H₁₀O₂ | IIA | T3 | 315 | 31 | 120 | 3.1 | 1.4 | 13.1 | Solvente; miscible en agua | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). Autoignition temperature media (≤350°C). Grupo IIA (lower relative hazard). Clase de temperatura T3. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). Medium autoignition (≤350°C). Grupo IIA (lower relative hazard). Clase de temperatura T3. Forms peroxides in storage (monitor inhibitors and shelf life). |
| Propionaldehyde | C₃H₆O | IIA | T1 | 311 | -39 | 49 | 1.5 | 2.1 | 15 | Aldehyde; muy volátil. | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Flash point ≤ 0 °C. Medium autoignition (≤350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. |
| Propionitrile | C₃H₅N | IIA | T2 | 480 | -1 | 97 | 2.2 | 2.8 | 23 | Nitrilo; toxic | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Wide flammability range. Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Wide flammability range. Flash point ≤ 0 °C. High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. |
| Silane | SiH₄ | IIC | T1 | — | No aplica (gas) | No aplica (gas) | 1.11 | 1.5 | 98 | Pyrophoric; ignición espontánea | Vapour density similar to air. Very low LEL (≤2% v/v). Wide flammability range (LEL–UEL). Gas: flash point not applicable. Grupo IIC (maximum ATEX design stringency). Clase de temperatura T1. | Very low LEL (≤2% v/v). Wide flammability range (LEL–UEL). Gas: flash point not applicable. Grupo IIC (maximum stringency). Clase de temperatura T1. Pyrophoric: ignición espontánea en aire. |
| Carbon disulfide (CS₂) | CS₂ | IIC | T6 | 95 | -30 | 46 | 2.264 | 1.3 | 50 | Muy baja temp. de ignición; vapores muy pesados |
| Dimethyl sulfide (DMS) | (CH₃)₂S | IIA | T3 | 206 | -20 | 37 | 2.1 | 2.2 | 19.7 | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature baja (≤250 °C). Grupo IIA (lower relative hazard). Clase de temperatura T3. | Vapours heavier than air (pooling in low-lying areas). Low LEL (≤3% v/v). Flash point ≤ 0 °C. Low autoignition (≤250 °C). Grupo IIA (lower relative hazard). Clase de temperatura T3. |
| Hydrogen sulfide | H₂S | IIB | T3 | 270 | No aplica (gas) | No aplica (gas) | 1.1763 | 4.3 | 46 | Toxic; unreliable odour warning | Vapour density similar to air. Moderate/high LEL. Wide flammability range (LEL–UEL). Gas: flash point not applicable. Autoignition temperature media (≤350°C). Grupo IIB (intermediate hazard). Clase de temperatura T3. | Wide flammability range (LEL–UEL). Gas: flash point not applicable. Medium autoignition (≤350°C). Grupo IIB (intermediate hazard). Clase de temperatura T3. Toxic letal; sense of smell NOT reliable (olfactory fatigue). |
| TAME (Tert-amyl methyl ether) | C₆H₁₄O | IIA | T1 | 415 | -28 | 87 | 3 | 1.3 | 8 | Éter combustible; gasoline additive. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C. High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. Forms peroxides in storage (monitor inhibitors and shelf life). |
| Tetrahydrothiophene (THT) | C₄H₈S | IIB | T3 | 260 | -2 | 118 | 3 | 1.7 | 12 | Odorante de gas; azufrado | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature media (≤350°C). Grupo IIB (intermediate hazard). Clase de temperatura T3. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C. Medium autoignition (≤350°C). Grupo IIB (intermediate hazard). Clase de temperatura T3. |
| Toluene | C₇H₈ | IIA | T1 | 535 | 4 | 110.6 | 3.1082 | 1.27 | 6.75 | Aromático; neurotoxic | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point bajo (≤23°C). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point bajo (≤23°C). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. |
| Triethylamine | (C₂H₅)₃N | IIA | — | — | -15 | 89 | 3.5 | 1.2 | 8 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C (easy ignition at low T). Grupo IIA (lower relative hazard). | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C. Grupo IIA (lower relative hazard). |
| Triethylene glycol | C₆H₁₄O₄ | IIA | T2 | 370 | 176 | 291 | 5.2 | 0.9 | 9.2 | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point >60°C. Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. Low volatility (high boiling point). | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T2. Low volatility (high boiling point). |
| Trimethylamine | C₃H₉N | IIB | T3 | 430 | -20 | 3.5 | 2 | 2 | 11.6 | Olor fuerte a pescado; corrosiva | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C (easy ignition at low T). Autoignition temperature alta (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T3. Highly volatile at ambient temperature. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point ≤ 0 °C. High autoignition (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T3. Highly volatile at 20–25 °C. |
| Trioxane | C₃H₆O₃ | IIB | T2 | 410 | 45 | 115 | 3.1 | 3.6 | 29 | Vapours heavier than air (pooling in low-lying areas). Moderate/high LEL. Wide flammability range. Flash point moderado (≤60°C). Autoignition temperature alta (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. | Vapours heavier than air (pooling in low-lying areas). Wide flammability range. Flash point moderado (≤60°C). High autoignition (>350°C). Grupo IIB (intermediate hazard). Clase de temperatura T2. |
| Xylene (mixed isomers) | C₈H₁₀ | IIA | T1 | 463 | 27 | 144 | 3.6655 | 1 | 6 | Aromático | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). Autoignition temperature alta (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. | Vapours heavier than air (pooling in low-lying areas). Very low LEL (≤2% v/v). Flash point moderado (≤60°C). High autoignition (>350°C). Grupo IIA (lower relative hazard). Clase de temperatura T1. |
| Natural gas | CH₄ (~₉₀%) | IIA | T1 | 540 | No aplica (gas) | -161 | 0.55 | 4.4 | 16.5 | Main component methane; más ligero que el aire; disperses easily. |