asset: hazardous-area-substance-classification

asset_type: classification

body: Hazardous area (explosive atmosphere) classification of individual flammable gases, vapours and combustible dusts. Each record is one substance as classified by one publisher, giving the apparatus / gas group (IIA, IIB, IIC, IIB+H2 under IEC 60079 and ATEX, or Class I Group A/B/C/D under the US National Electrical Code), the temperature class (T1 to T6), and the autoignition temperature the publisher prints. Answers 'is toluene IIA or IIB', 'what temperature class is acetone', 'MEK autoignition temperature for explosion proof equipment', 'NEC Group C equivalent IEC gas group', 'what gas group is hydrogen sulphide', and 'ethylene gas group and T class'. Publishers disagree on the autoignition temperature of the same substance -- hydrogen is printed as 500 C, 520 C and 560 C by three different manufacturers, and ethylene as 450 C and 490 C -- and because the temperature class is derived from that number the disagreement changes which equipment is legal to install. Every value is quoted from the page that printed it and attributed, so the disagreements are visible rather than averaged away.

key_field: substance

licence: Facts extracted from freely published manufacturer and industry reference pages. Gas group and temperature class assignments are safety classifications and the underlying values are facts, not copyrightable expression. The authoritative documents (NFPA 497, IEC 60079-20-1) are not reproduced and were not opened -- the fact is taken, never the document. No bulk take from any single source: records come one or two substances at a time from five separate publishers.

title: Gas group, temperature class and autoignition temperature by substance

type: dataset


body:
**Substance:** Di-ethyl ether

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIB

**Temperature class:** T4

**Ignition temperature (C):** 160

> Di-ethyl ether | T4 | IIB | 160

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

classification_system: IEC / ATEX

group: IIB

source_quote: Di-ethyl ether | T4 | IIB | 160

substance: Di-ethyl ether

title: Di-ethyl ether — Gas group, temperature class and autoignition temperature by substance

type: classification


body:
**Substance:** Benzaldehyde

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIA

**Temperature class:** T4

**Ignition temperature (C):** 192

> Benzaldehyde, which has an auto-ignition temperature of 192° C, will be classified in the T4 temperature class.

Source: <https://www.cortemgroup.com/en/news/the-zones-of-the-plant-the-groups-and-the-temperature-classes-of-gases>

group: IIA

substance: Benzaldehyde

title: Benzaldehyde — Gas group, temperature class and autoignition temperature by substance

unverified_fields: group


body:
**Substance:** Cyclohexane

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIA

**Temperature class:** T3

**Ignition temperature (C):** 245

> Cyclohexane | T3 | IIA | 245

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

source_quote: Cyclohexane | T3 | IIA | 245

substance: Cyclohexane

title: Cyclohexane — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Gasoline (petrol)

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIA

**Temperature class:** T3

**Ignition temperature (C):** 280

> Gasoline (petrol) | T3 | IIA | 280

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

source_quote: Gasoline (petrol) | T3 | IIA | 280

substance: Gasoline (petrol)

title: Gasoline (petrol) — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Gasoline

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIA

**Ignition temperature (C):** 280

**Ignition temperature (F):** 536

> Gasoline | D | 280 | 536 | 600 PSI | IIA

Source: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>

substance: Gasoline

title: Gasoline — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Gasoline

**Classification system:** NEC 500 (North America)

**Apparatus / gas group:** D

**Ignition temperature (C):** 280

**Ignition temperature (F):** 536

> Gasoline | D | 280 | 536 | 600 PSI | IIA

Source: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>

classification_system: NEC 500 (North America)

group: D


body:
**Substance:** Kerosene

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIA

**Temperature class:** T3

**Ignition temperature (C):** 295

> Kerosene | T3 | IIA | 295

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

source_quote: Kerosene | T3 | IIA | 295

substance: Kerosene

title: Kerosene — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Acetylene

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIC

**Ignition temperature (C):** 305

**Ignition temperature (F):** 581

> Acetylene | A | 305 | 581 | 6,000 PSI | IIC

Source: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>

group: IIC

substance: Acetylene

title: Acetylene — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Acetylene

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIC

**Temperature class:** T2

**Ignition temperature (C):** 305

> Acetylene | T2 | IIC | 305

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

source_quote: Acetylene | T2 | IIC | 305


body:
**Substance:** Acetylene

**Classification system:** NEC 500 (North America)

**Apparatus / gas group:** A

**Ignition temperature (C):** 305

**Ignition temperature (F):** 581

> Acetylene | A | 305 | 581 | 6,000 PSI | IIC

Source: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>

group: A


body:
**Substance:** Ethanol (ethyl alcohol)

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIA

**Temperature class:** T2

**Ignition temperature (C):** 365

> Ethanol (ethyl alcohol) | T2 | IIA | 365

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

substance: Ethanol (ethyl alcohol)

title: Ethanol (ethyl alcohol) — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Propan-1-ol (n-propyl alcohol)

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIB

**Temperature class:** T2

**Ignition temperature (C):** 371

> Propan-1-ol (n-propyl alcohol) | T2 | IIB | 371

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

substance: Propan-1-ol (n-propyl alcohol)

title: Propan-1-ol (n-propyl alcohol) — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Coal dust (lignite)

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIIB

**Ignition temperature (C):** 380

**Dust layer ignition temperature (C):** 225

> Coal dust (lignite) | IIIB | 380 | 225

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

group: IIIB

source_quote: Coal dust (lignite) | IIIB | 380 | 225

substance: Coal dust (lignite)

title: Coal dust (lignite) — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Propan-2-ol (iso-propyl alcohol)

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIA

**Temperature class:** T2

**Ignition temperature (C):** 399

> Propan-2-ol (iso-propyl alcohol) | T2 | IIA | 399

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

substance: Propan-2-ol (iso-propyl alcohol)

title: Propan-2-ol (iso-propyl alcohol) — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Butane

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIA

**Temperature class:** T2

**Ignition temperature (C):** 405

> Butane | T2 | IIA | 405

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

source_quote: Butane | T2 | IIA | 405

substance: Butane

title: Butane — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Methyl cellulose

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIIB

**Ignition temperature (C):** 420

**Dust layer ignition temperature (C):** 320

> Methyl cellulose | IIIB | 420 | 320

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

source_quote: Methyl cellulose | IIIB | 420 | 320

substance: Methyl cellulose

title: Methyl cellulose — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Polythene

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIIB

**Ignition temperature (C):** 420

**Dust layer ignition temperature (C):** (melts)

> Polythene | IIIB | 420 | (melts)

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

layer_ignition_temperature_c: (melts)

source_quote: Polythene | IIIB | 420 | (melts)

substance: Polythene

title: Polythene — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Acetic acid

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIA

**Temperature class:** T1

**Ignition temperature (C):** 427

> Acetic acid | T1 | IIA | 427

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

source_quote: Acetic acid | T1 | IIA | 427

substance: Acetic acid

title: Acetic acid — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Ethylene

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIB

**Ignition temperature (C):** 450

**Ignition temperature (F):** 842

> Ethylene | C | 450 | 842 | 1,200 PSI | IIB

Source: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>

substance: Ethylene

title: Ethylene — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Ethylene

**Classification system:** NEC 500 (North America)

**Apparatus / gas group:** C

**Ignition temperature (C):** 450

**Ignition temperature (F):** 842

> Ethylene | C | 450 | 842 | 1,200 PSI | IIB

Source: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>

group: C


body:
**Substance:** Starch

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIIB

**Ignition temperature (C):** 460

**Dust layer ignition temperature (C):** 435

> Starch | IIIB | 460 | 435

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

source_quote: Starch | IIIB | 460 | 435

substance: Starch

title: Starch — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Xylene

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIA

**Temperature class:** T1

**Ignition temperature (C):** 463

> Xylene | T1 | IIA | 463

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

source_quote: Xylene | T1 | IIA | 463

substance: Xylene

title: Xylene — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Acetone

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIA

**Temperature class:** T1

**Ignition temperature (C):** 465

> Acetone | T1 | IIA | 465

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

source_quote: Acetone | T1 | IIA | 465

substance: Acetone

title: Acetone — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Methanol (methyl alcohol)

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIA

**Temperature class:** T2

**Ignition temperature (C):** 470

> Methanol (methyl alcohol) | T2 | IIA | 470

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

substance: Methanol (methyl alcohol)

title: Methanol (methyl alcohol) — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Propane

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIA

**Temperature class:** T1

**Ignition temperature (C):** 470

> Propane | T1 | IIA | 470

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

source_quote: Propane | T1 | IIA | 470

substance: Propane

title: Propane — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Ethylene

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIB

**Temperature class:** T2

**Ignition temperature (C):** 490

> Ethylene | T2 | IIB | 490

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

source_quote: Ethylene | T2 | IIB | 490


body:
**Substance:** Flour

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIIB

**Ignition temperature (C):** 490

**Dust layer ignition temperature (C):** 340

> Flour | IIIB | 490 | 340

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

source_quote: Flour | IIIB | 490 | 340

substance: Flour

title: Flour — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Sugar

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIIB

**Ignition temperature (C):** 490

**Dust layer ignition temperature (C):** 460

> Sugar | IIIB | 490 | 460

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

source_quote: Sugar | IIIB | 490 | 460

substance: Sugar

title: Sugar — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Hydrogen

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIC

**Temperature class:** T1

**Ignition temperature (C):** 500

> Hydrogen | T1 | IIC | 500

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

source_quote: Hydrogen | T1 | IIC | 500

substance: Hydrogen

title: Hydrogen — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Methyl ethyl ketone (MEK)

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIB

**Temperature class:** T2

**Ignition temperature (C):** 505

> Methyl ethyl ketone (MEK) | T2 | IIB | 505

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

substance: Methyl ethyl ketone (MEK)

title: Methyl ethyl ketone (MEK) — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Grain dust

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIIB

**Ignition temperature (C):** 510

**Dust layer ignition temperature (C):** 300

> Grain dust | IIIB | 510 | 300

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

source_quote: Grain dust | IIIB | 510 | 300

substance: Grain dust

title: Grain dust — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Hydrogen

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIC

**Ignition temperature (C):** 520

**Ignition temperature (F):** 968

> Hydrogen | B | 520 | 968 | 6,000 PSI | IIC

Source: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>


body:
**Substance:** Hydrogen

**Classification system:** NEC 500 (North America)

**Apparatus / gas group:** B

**Ignition temperature (C):** 520

**Ignition temperature (F):** 968

> Hydrogen | B | 520 | 968 | 6,000 PSI | IIC

Source: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>

group: B


body:
**Substance:** Phenolic resin

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIIB

**Ignition temperature (C):** 530

**Dust layer ignition temperature (C):** >450

> Phenolic resin | IIIB | 530 | >450

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

source_quote: Phenolic resin | IIIB | 530 | >450

substance: Phenolic resin

title: Phenolic resin — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Toluene

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIA

**Temperature class:** T1

**Ignition temperature (C):** 535

> Toluene | T1 | IIA | 535

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

source_quote: Toluene | T1 | IIA | 535

substance: Toluene

title: Toluene — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Hydrogen

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIC

**Temperature class:** T1

**Ignition temperature (C):** 560

> Hydrogen, which has an auto-ignition temperature of 560° C, will be classified in the T1 temperature class.

Source: <https://www.cortemgroup.com/en/news/the-zones-of-the-plant-the-groups-and-the-temperature-classes-of-gases>


body:
**Substance:** Methane (natural gas) (non-mining)

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIA

**Temperature class:** T1

**Ignition temperature (C):** 580

> Methane (natural gas) (non-mining) | T1 | IIA | 580

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

substance: Methane (natural gas) (non-mining)

title: Methane (natural gas) (non-mining) — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Aluminium

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIIC

**Ignition temperature (C):** 590

**Dust layer ignition temperature (C):** >450

> Aluminium | IIIC | 590 | >450

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

group: IIIC

source_quote: Aluminium | IIIC | 590 | >450

substance: Aluminium

title: Aluminium — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Ammonia

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIA

**Temperature class:** T1

**Ignition temperature (C):** 651

> Ammonia | T1 | IIA | 651

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

source_quote: Ammonia | T1 | IIA | 651

substance: Ammonia

title: Ammonia — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** PVC

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIIB

**Ignition temperature (C):** 700

**Dust layer ignition temperature (C):** >450

> PVC | IIIB | 700 | >450

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

substance: PVC

title: PVC — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Soot

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIIB

**Ignition temperature (C):** 810

**Dust layer ignition temperature (C):** 570

> Soot | IIIB | 810 | 570

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

substance: Soot

title: Soot — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Carbon Disulphine

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIC

**Temperature class:** T6

**Ignition temperature (C):** 95

> Carbon Disulphine | T6 | IIC | 95

Source: <https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga>

source_quote: Carbon Disulphine | T6 | IIC | 95

substance: Carbon Disulphine

title: Carbon Disulphine — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Acetone

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIA

> IIA | >0.90 | >0.80 | Methane, propane, butane, acetone, ethanol, benzene, diesel, ammonia

Source: <https://exknowledge.com/pages/gas-groups.html>


body:
**Substance:** Acetylene

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIC

> IIC | Hydrogen, acetylene, carbon disulphide

Source: <https://exknowledge.com/pages/gas-groups.html>

substance: Acetylene

title: Acetylene — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Ammonia

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIA

> IIA | >0.90 | >0.80 | Methane, propane, butane, acetone, ethanol, benzene, diesel, ammonia

Source: <https://exknowledge.com/pages/gas-groups.html>


body:
**Substance:** Benzene

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIA

> IIA | >0.90 | >0.80 | Methane, propane, butane, acetone, ethanol, benzene, diesel, ammonia

Source: <https://exknowledge.com/pages/gas-groups.html>

substance: Benzene

title: Benzene — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Butane

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIA

> IIA | >0.90 | >0.80 | Methane, propane, butane, acetone, ethanol, benzene, diesel, ammonia

Source: <https://exknowledge.com/pages/gas-groups.html>

substance: Butane

title: Butane — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Carbon disulphide

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIC

> IIC | Hydrogen, acetylene, carbon disulphide

Source: <https://exknowledge.com/pages/gas-groups.html>

substance: Carbon disulphide

title: Carbon disulphide — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Diesel

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIA

> IIA | >0.90 | >0.80 | Methane, propane, butane, acetone, ethanol, benzene, diesel, ammonia

Source: <https://exknowledge.com/pages/gas-groups.html>

substance: Diesel

title: Diesel — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Diethyl ether

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIB

> IIB | 0.50–0.90 | 0.45–0.80 | Ethylene, hydrogen sulphide, diethyl ether, ethylene oxide, town gas

Source: <https://exknowledge.com/pages/gas-groups.html>

substance: Diethyl ether

title: Diethyl ether — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Ethanol

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIA

> IIA | >0.90 | >0.80 | Methane, propane, butane, acetone, ethanol, benzene, diesel, ammonia

Source: <https://exknowledge.com/pages/gas-groups.html>

substance: Ethanol

title: Ethanol — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Ethylene oxide

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIB

> IIB | 0.50–0.90 | 0.45–0.80 | Ethylene, hydrogen sulphide, diethyl ether, ethylene oxide, town gas

Source: <https://exknowledge.com/pages/gas-groups.html>

substance: Ethylene oxide

title: Ethylene oxide — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Ethylene

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIB

> IIB | 0.50–0.90 | 0.45–0.80 | Ethylene, hydrogen sulphide, diethyl ether, ethylene oxide, town gas

Source: <https://exknowledge.com/pages/gas-groups.html>

substance: Ethylene

title: Ethylene — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Hydrogen sulphide

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIB

> IIB | 0.50–0.90 | 0.45–0.80 | Ethylene, hydrogen sulphide, diethyl ether, ethylene oxide, town gas

Source: <https://exknowledge.com/pages/gas-groups.html>

substance: Hydrogen sulphide

title: Hydrogen sulphide — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Hydrogen

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIC

> IIC | Hydrogen, acetylene, carbon disulphide

Source: <https://exknowledge.com/pages/gas-groups.html>

substance: Hydrogen

title: Hydrogen — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Methane

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIA

> IIA | >0.90 | >0.80 | Methane, propane, butane, acetone, ethanol, benzene, diesel, ammonia

Source: <https://exknowledge.com/pages/gas-groups.html>

substance: Methane

title: Methane — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** n-Hexane

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIA

> Group IIA: Methane (CH₄) — natural gas, biogas Propane (C₃H₈) — LPG Butane (C₄H₁₀) — LPG Acetone — solvents Ethanol — pharmaceutical, food/beverage Benzene, toluene, xylene — petrochemical Ammonia (NH₃) — refrigeration, agriculture n-Hexane — extraction processes

Source: <https://exknowledge.com/pages/gas-groups.html>

substance: n-Hexane

title: n-Hexane — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Propane

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIA

> IIA | >0.90 | >0.80 | Methane, propane, butane, acetone, ethanol, benzene, diesel, ammonia

Source: <https://exknowledge.com/pages/gas-groups.html>

substance: Propane

title: Propane — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Toluene

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIA

> Group IIA: Methane (CH₄) — natural gas, biogas Propane (C₃H₈) — LPG Butane (C₄H₁₀) — LPG Acetone — solvents Ethanol — pharmaceutical, food/beverage Benzene, toluene, xylene — petrochemical Ammonia (NH₃) — refrigeration, agriculture n-Hexane — extraction processes

Source: <https://exknowledge.com/pages/gas-groups.html>

substance: Toluene

title: Toluene — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Town gas

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIB

> IIB | 0.50–0.90 | 0.45–0.80 | Ethylene, hydrogen sulphide, diethyl ether, ethylene oxide, town gas

Source: <https://exknowledge.com/pages/gas-groups.html>

substance: Town gas

title: Town gas — Gas group, temperature class and autoignition temperature by substance


body:
**Substance:** Xylene

**Classification system:** IEC / ATEX

**Apparatus / gas group:** IIA

> Group IIA: Methane (CH₄) — natural gas, biogas Propane (C₃H₈) — LPG Butane (C₄H₁₀) — LPG Acetone — solvents Ethanol — pharmaceutical, food/beverage Benzene, toluene, xylene — petrochemical Ammonia (NH₃) — refrigeration, agriculture n-Hexane — extraction processes

Source: <https://exknowledge.com/pages/gas-groups.html>

substance: Xylene

title: Xylene — Gas group, temperature class and autoignition temperature by substance