classification_system string | derived_fields list | group string | id string | ignition_temperature_c string | located_fields list | source string | source_quote string | substance string | temperature_class string | url string | verified_fields list | also_reported list | disagreements list | ignition_temperature_f string | layer_ignition_temperature_c string |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
IEC / ATEX | [
"classification_system"
] | IIA | 427-iec-atex-acetic-acid | 427 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | Acetic acid | T1 | IIA | 427 | Acetic acid | T1 | https://referencesource.org/hazardous-area-substance-classification/427-iec-atex-acetic-acid/ | [
"group",
"ignition_temperature_c",
"substance",
"temperature_class"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIA | 465-iec-atex-acetone | 465 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | Acetone | T1 | IIA | 465 | Acetone | T1 | https://referencesource.org/hazardous-area-substance-classification/465-iec-atex-acetone/ | [
"group",
"ignition_temperature_c",
"substance",
"temperature_class"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIA | iec-atex-acetone | null | [
"group"
] | https://exknowledge.com/pages/gas-groups.html | IIA | >0.90 | >0.80 | Methane, propane, butane, acetone, ethanol, benzene, diesel, ammonia | Acetone | null | https://referencesource.org/hazardous-area-substance-classification/iec-atex-acetone/ | [
"group",
"substance"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIC | 305-iec-atex-acetylene | 305 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | Acetylene | T2 | IIC | 305 | Acetylene | T2 | https://referencesource.org/hazardous-area-substance-classification/305-iec-atex-acetylene/ | [
"group",
"ignition_temperature_c",
"substance",
"temperature_class"
] | [
{
"as_of": "2026-08-06T00:00:00",
"field": "ignition_temperature_f",
"source": "https://ldpi-inc.com/resources/classification-codes/class-1-locations/",
"source_quote": "Acetylene | A | 305 | 581 | 6,000 PSI | IIC",
"value": "581"
}
] | [] | null | null |
NEC 500 (North America) | [
"classification_system"
] | A | 305-nec-500-north-america-acetylene | 305 | [
"group"
] | https://ldpi-inc.com/resources/classification-codes/class-1-locations/ | Acetylene | A | 305 | 581 | 6,000 PSI | IIC | Acetylene | null | https://referencesource.org/hazardous-area-substance-classification/305-nec-500-north-america-acetylene/ | [
"group",
"ignition_temperature_c",
"ignition_temperature_f",
"substance"
] | null | null | 581 | null |
IEC / ATEX | [
"classification_system"
] | IIC | iec-atex-acetylene | null | [
"group"
] | https://exknowledge.com/pages/gas-groups.html | IIC | Hydrogen, acetylene, carbon disulphide | Acetylene | null | https://referencesource.org/hazardous-area-substance-classification/iec-atex-acetylene/ | [
"group",
"substance"
] | null | null | null | null |
NEC 500 (North America) | [
"classification_system"
] | Group A | nec-500-north-america-acetylene | null | [
"group"
] | https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf | Acetylene Group A | Acetylene | null | https://referencesource.org/hazardous-area-substance-classification/nec-500-north-america-acetylene/ | [
"group",
"substance"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIIC | 590-iec-atex-aluminium | 590 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | Aluminium | IIIC | 590 | >450 | Aluminium | null | https://referencesource.org/hazardous-area-substance-classification/590-iec-atex-aluminium/ | [
"group",
"ignition_temperature_c",
"layer_ignition_temperature_c",
"substance"
] | null | null | null | >450 |
IEC / ATEX | [
"classification_system"
] | IIA | 651-iec-atex-ammonia | 651 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | Ammonia | T1 | IIA | 651 | Ammonia | T1 | https://referencesource.org/hazardous-area-substance-classification/651-iec-atex-ammonia/ | [
"group",
"ignition_temperature_c",
"substance",
"temperature_class"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIA | iec-atex-ammonia | null | [
"group"
] | https://exknowledge.com/pages/gas-groups.html | IIA | >0.90 | >0.80 | Methane, propane, butane, acetone, ethanol, benzene, diesel, ammonia | Ammonia | null | https://referencesource.org/hazardous-area-substance-classification/iec-atex-ammonia/ | [
"group",
"substance"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIA | 192-iec-atex-benzaldehyde | 192 | [
"group"
] | https://www.cortemgroup.com/en/news/the-zones-of-the-plant-the-groups-and-the-temperature-classes-of-gases | Benzaldehyde, which has an auto-ignition temperature of 192° C, will be classified in the T4 temperature class. | Benzaldehyde | T4 | https://referencesource.org/hazardous-area-substance-classification/192-iec-atex-benzaldehyde/ | [
"ignition_temperature_c",
"substance",
"temperature_class"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIA | 555-iec-atex-benzene | 555 | [
"group"
] | https://greenishco.com/Downloads/ATEX.pdf | Benzene C6H6 555 T1 IIA | Benzene | T1 | https://referencesource.org/hazardous-area-substance-classification/555-iec-atex-benzene/ | [
"group",
"ignition_temperature_c",
"substance",
"temperature_class"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIA | iec-atex-benzene | null | [
"group"
] | https://exknowledge.com/pages/gas-groups.html | IIA | >0.90 | >0.80 | Methane, propane, butane, acetone, ethanol, benzene, diesel, ammonia | Benzene | null | https://referencesource.org/hazardous-area-substance-classification/iec-atex-benzene/ | [
"group",
"substance"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIA | 365-iec-atex-butane | 365 | [
"group"
] | https://greenishco.com/Downloads/ATEX.pdf | Butane C4H10 365 T2 IIA | Butane | T2 | https://referencesource.org/hazardous-area-substance-classification/365-iec-atex-butane/ | [
"group",
"ignition_temperature_c",
"substance",
"temperature_class"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIA | 405-iec-atex-butane | 405 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | Butane | T2 | IIA | 405 | Butane | T2 | https://referencesource.org/hazardous-area-substance-classification/405-iec-atex-butane/ | [
"group",
"ignition_temperature_c",
"substance",
"temperature_class"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIA | iec-atex-butane | null | [
"group"
] | https://exknowledge.com/pages/gas-groups.html | IIA | >0.90 | >0.80 | Methane, propane, butane, acetone, ethanol, benzene, diesel, ammonia | Butane | null | https://referencesource.org/hazardous-area-substance-classification/iec-atex-butane/ | [
"group",
"substance"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIC | 102-iec-atex-carbon-disulphide | 102 | [
"group"
] | https://greenishco.com/Downloads/ATEX.pdf | Carbon disulphide CS2 102 T5 IIC | Carbon disulphide | T5 | https://referencesource.org/hazardous-area-substance-classification/102-iec-atex-carbon-disulphide/ | [
"group",
"ignition_temperature_c",
"substance",
"temperature_class"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIC | iec-atex-carbon-disulphide | null | [
"group"
] | https://exknowledge.com/pages/gas-groups.html | IIC | Hydrogen, acetylene, carbon disulphide | Carbon disulphide | null | https://referencesource.org/hazardous-area-substance-classification/iec-atex-carbon-disulphide/ | [
"group",
"substance"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIC | 95-iec-atex-carbon-disulphine | 95 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | Carbon Disulphine | T6 | IIC | 95 | Carbon Disulphine | T6 | https://referencesource.org/hazardous-area-substance-classification/95-iec-atex-carbon-disulphine/ | [
"group",
"ignition_temperature_c",
"substance",
"temperature_class"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIIB | 380-iec-atex-coal-dust-lignite | 380 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | Coal dust (lignite) | IIIB | 380 | 225 | Coal dust (lignite) | null | https://referencesource.org/hazardous-area-substance-classification/380-iec-atex-coal-dust-lignite/ | [
"group",
"ignition_temperature_c",
"layer_ignition_temperature_c",
"substance"
] | null | null | null | 225 |
NEC 500 (North America) | [
"classification_system"
] | Group E | nec-500-north-america-combustible-metal-dusts | null | [
"group"
] | https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf | Combustible Metal Dusts Group E | Combustible Metal Dusts | null | https://referencesource.org/hazardous-area-substance-classification/nec-500-north-america-combustible-metal-dusts/ | [
"group",
"substance"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIA | 245-iec-atex-cyclohexane | 245 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | Cyclohexane | T3 | IIA | 245 | Cyclohexane | T3 | https://referencesource.org/hazardous-area-substance-classification/245-iec-atex-cyclohexane/ | [
"group",
"ignition_temperature_c",
"substance",
"temperature_class"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIB | 160-iec-atex-di-ethyl-ether | 160 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | Di-ethyl ether | T4 | IIB | 160 | Di-ethyl ether | T4 | https://referencesource.org/hazardous-area-substance-classification/160-iec-atex-di-ethyl-ether/ | [
"group",
"ignition_temperature_c",
"substance",
"temperature_class"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIA | iec-atex-diesel | null | [
"group"
] | https://exknowledge.com/pages/gas-groups.html | IIA | >0.90 | >0.80 | Methane, propane, butane, acetone, ethanol, benzene, diesel, ammonia | Diesel | null | https://referencesource.org/hazardous-area-substance-classification/iec-atex-diesel/ | [
"group",
"substance"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIB | iec-atex-diethyl-ether | null | [
"group"
] | https://exknowledge.com/pages/gas-groups.html | IIB | 0.50–0.90 | 0.45–0.80 | Ethylene, hydrogen sulphide, diethyl ether, ethylene oxide, town gas | Diethyl ether | null | https://referencesource.org/hazardous-area-substance-classification/iec-atex-diethyl-ether/ | [
"group",
"substance"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIA | iec-atex-ethanol | null | [
"group"
] | https://exknowledge.com/pages/gas-groups.html | IIA | >0.90 | >0.80 | Methane, propane, butane, acetone, ethanol, benzene, diesel, ammonia | Ethanol | null | https://referencesource.org/hazardous-area-substance-classification/iec-atex-ethanol/ | [
"group",
"substance"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIA | 365-iec-atex-ethanol-ethyl-alcohol | 365 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | Ethanol (ethyl alcohol) | T2 | IIA | 365 | Ethanol (ethyl alcohol) | T2 | https://referencesource.org/hazardous-area-substance-classification/365-iec-atex-ethanol-ethyl-alcohol/ | [
"group",
"ignition_temperature_c",
"substance",
"temperature_class"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIB | 450-iec-atex-ethylene | 450 | [
"group"
] | https://ldpi-inc.com/resources/classification-codes/class-1-locations/ | Ethylene | C | 450 | 842 | 1,200 PSI | IIB | Ethylene | null | https://referencesource.org/hazardous-area-substance-classification/450-iec-atex-ethylene/ | [
"group",
"ignition_temperature_c",
"ignition_temperature_f",
"substance"
] | null | null | 842 | null |
NEC 500 (North America) | [
"classification_system"
] | C | 450-nec-500-north-america-ethylene | 450 | [
"group"
] | https://ldpi-inc.com/resources/classification-codes/class-1-locations/ | Ethylene | C | 450 | 842 | 1,200 PSI | IIB | Ethylene | null | https://referencesource.org/hazardous-area-substance-classification/450-nec-500-north-america-ethylene/ | [
"group",
"ignition_temperature_c",
"ignition_temperature_f",
"substance"
] | null | null | 842 | null |
IEC / ATEX | [
"classification_system"
] | IIB | 490-iec-atex-ethylene | 490 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | Ethylene | T2 | IIB | 490 | Ethylene | T2 | https://referencesource.org/hazardous-area-substance-classification/490-iec-atex-ethylene/ | [
"group",
"ignition_temperature_c",
"substance",
"temperature_class"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIB | iec-atex-ethylene | null | [
"group"
] | https://exknowledge.com/pages/gas-groups.html | IIB | 0.50–0.90 | 0.45–0.80 | Ethylene, hydrogen sulphide, diethyl ether, ethylene oxide, town gas | Ethylene | null | https://referencesource.org/hazardous-area-substance-classification/iec-atex-ethylene/ | [
"group",
"substance"
] | null | null | null | null |
NEC 500 (North America) | [
"classification_system"
] | Group C | nec-500-north-america-ethylene | null | [
"group"
] | https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf | Ethylene Group C | Ethylene | null | https://referencesource.org/hazardous-area-substance-classification/nec-500-north-america-ethylene/ | [
"group",
"substance"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIB | iec-atex-ethylene-oxide | null | [
"group"
] | https://exknowledge.com/pages/gas-groups.html | IIB | 0.50–0.90 | 0.45–0.80 | Ethylene, hydrogen sulphide, diethyl ether, ethylene oxide, town gas | Ethylene oxide | null | https://referencesource.org/hazardous-area-substance-classification/iec-atex-ethylene-oxide/ | [
"group",
"substance"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIIB | 490-iec-atex-flour | 490 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | Flour | IIIB | 490 | 340 | Flour | null | https://referencesource.org/hazardous-area-substance-classification/490-iec-atex-flour/ | [
"group",
"ignition_temperature_c",
"layer_ignition_temperature_c",
"substance"
] | null | null | null | 340 |
IEC / ATEX | [
"classification_system"
] | IIA | 280-iec-atex-gasoline | 280 | [
"group"
] | https://ldpi-inc.com/resources/classification-codes/class-1-locations/ | Gasoline | D | 280 | 536 | 600 PSI | IIA | Gasoline | null | https://referencesource.org/hazardous-area-substance-classification/280-iec-atex-gasoline/ | [
"group",
"ignition_temperature_c",
"ignition_temperature_f",
"substance"
] | null | null | 536 | null |
NEC 500 (North America) | [
"classification_system"
] | D | 280-nec-500-north-america-gasoline | 280 | [
"group"
] | https://ldpi-inc.com/resources/classification-codes/class-1-locations/ | Gasoline | D | 280 | 536 | 600 PSI | IIA | Gasoline | null | https://referencesource.org/hazardous-area-substance-classification/280-nec-500-north-america-gasoline/ | [
"group",
"ignition_temperature_c",
"ignition_temperature_f",
"substance"
] | null | null | 536 | null |
IEC / ATEX | [
"classification_system"
] | IIA | 280-iec-atex-gasoline-petrol | 280 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | Gasoline (petrol) | T3 | IIA | 280 | Gasoline (petrol) | T3 | https://referencesource.org/hazardous-area-substance-classification/280-iec-atex-gasoline-petrol/ | [
"group",
"ignition_temperature_c",
"substance",
"temperature_class"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIIB | 510-iec-atex-grain-dust | 510 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | Grain dust | IIIB | 510 | 300 | Grain dust | null | https://referencesource.org/hazardous-area-substance-classification/510-iec-atex-grain-dust/ | [
"group",
"ignition_temperature_c",
"layer_ignition_temperature_c",
"substance"
] | null | null | null | 300 |
IEC / ATEX | [
"classification_system"
] | IIC | 500-iec-atex-hydrogen | 500 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | Hydrogen | T1 | IIC | 500 | Hydrogen | T1 | https://referencesource.org/hazardous-area-substance-classification/500-iec-atex-hydrogen/ | [
"group",
"ignition_temperature_c",
"substance",
"temperature_class"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIC | 520-iec-atex-hydrogen | 520 | [
"group"
] | https://ldpi-inc.com/resources/classification-codes/class-1-locations/ | Hydrogen | B | 520 | 968 | 6,000 PSI | IIC | Hydrogen | null | https://referencesource.org/hazardous-area-substance-classification/520-iec-atex-hydrogen/ | [
"group",
"ignition_temperature_c",
"ignition_temperature_f",
"substance"
] | null | null | 968 | null |
NEC 500 (North America) | [
"classification_system"
] | B | 520-nec-500-north-america-hydrogen | 520 | [
"group"
] | https://ldpi-inc.com/resources/classification-codes/class-1-locations/ | Hydrogen | B | 520 | 968 | 6,000 PSI | IIC | Hydrogen | null | https://referencesource.org/hazardous-area-substance-classification/520-nec-500-north-america-hydrogen/ | [
"group",
"ignition_temperature_c",
"ignition_temperature_f",
"substance"
] | null | null | 968 | null |
IEC / ATEX | [
"classification_system"
] | IIC | 560-iec-atex-hydrogen | 560 | [
"group"
] | https://www.cortemgroup.com/en/news/the-zones-of-the-plant-the-groups-and-the-temperature-classes-of-gases | Hydrogen, which has an auto-ignition temperature of 560° C, will be classified in the T1 temperature class. | Hydrogen | T1 | https://referencesource.org/hazardous-area-substance-classification/560-iec-atex-hydrogen/ | [
"ignition_temperature_c",
"substance",
"temperature_class"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIC | iec-atex-hydrogen | null | [
"group"
] | https://exknowledge.com/pages/gas-groups.html | IIC | Hydrogen, acetylene, carbon disulphide | Hydrogen | null | https://referencesource.org/hazardous-area-substance-classification/iec-atex-hydrogen/ | [
"group",
"substance"
] | null | null | null | null |
NEC 500 (North America) | [
"classification_system"
] | Group B | nec-500-north-america-hydrogen | null | [
"group"
] | https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf | Hydrogen Group B | Hydrogen | null | https://referencesource.org/hazardous-area-substance-classification/nec-500-north-america-hydrogen/ | [
"group",
"substance"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIB | 270-iec-atex-hydrogen-sulphide | 270 | [
"group"
] | https://greenishco.com/Downloads/ATEX.pdf | Hydrogen sulphide H2S 270 T3 IIB | Hydrogen sulphide | T3 | https://referencesource.org/hazardous-area-substance-classification/270-iec-atex-hydrogen-sulphide/ | [
"group",
"ignition_temperature_c",
"substance",
"temperature_class"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIB | iec-atex-hydrogen-sulphide | null | [
"group"
] | https://exknowledge.com/pages/gas-groups.html | IIB | 0.50–0.90 | 0.45–0.80 | Ethylene, hydrogen sulphide, diethyl ether, ethylene oxide, town gas | Hydrogen sulphide | null | https://referencesource.org/hazardous-area-substance-classification/iec-atex-hydrogen-sulphide/ | [
"group",
"substance"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIA | 295-iec-atex-kerosene | 295 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | Kerosene | T3 | IIA | 295 | Kerosene | T3 | https://referencesource.org/hazardous-area-substance-classification/295-iec-atex-kerosene/ | [
"group",
"ignition_temperature_c",
"substance",
"temperature_class"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIA | iec-atex-methane | null | [
"group"
] | https://exknowledge.com/pages/gas-groups.html | IIA | >0.90 | >0.80 | Methane, propane, butane, acetone, ethanol, benzene, diesel, ammonia | Methane | null | https://referencesource.org/hazardous-area-substance-classification/iec-atex-methane/ | [
"group",
"substance"
] | null | null | null | null |
NEC 500 (North America) | [
"classification_system"
] | Group D | nec-500-north-america-methane-mining | null | [
"group"
] | https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf | Methane (mining) Group D | Methane (mining) | null | https://referencesource.org/hazardous-area-substance-classification/nec-500-north-america-methane-mining/ | [
"group",
"substance"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIA | 580-iec-atex-methane-natural-gas-non-mining | 580 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | Methane (natural gas) (non-mining) | T1 | IIA | 580 | Methane (natural gas) (non-mining) | T1 | https://referencesource.org/hazardous-area-substance-classification/580-iec-atex-methane-natural-gas-non-mining/ | [
"group",
"ignition_temperature_c",
"substance",
"temperature_class"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIA | iec-atex-methane-natural-gas-non-mining | null | [
"group"
] | https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf | IIA Methane (natural gas, non-mining) | Methane (natural gas, non-mining) | null | https://referencesource.org/hazardous-area-substance-classification/iec-atex-methane-natural-gas-non-mining/ | [
"group",
"substance"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIA | 470-iec-atex-methanol-methyl-alcohol | 470 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | Methanol (methyl alcohol) | T2 | IIA | 470 | Methanol (methyl alcohol) | T2 | https://referencesource.org/hazardous-area-substance-classification/470-iec-atex-methanol-methyl-alcohol/ | [
"group",
"ignition_temperature_c",
"substance",
"temperature_class"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIIB | 420-iec-atex-methyl-cellulose | 420 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | Methyl cellulose | IIIB | 420 | 320 | Methyl cellulose | null | https://referencesource.org/hazardous-area-substance-classification/420-iec-atex-methyl-cellulose/ | [
"group",
"ignition_temperature_c",
"layer_ignition_temperature_c",
"substance"
] | null | null | null | 320 |
IEC / ATEX | [
"classification_system"
] | IIB | 505-iec-atex-methyl-ethyl-ketone-mek | 505 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | Methyl ethyl ketone (MEK) | T2 | IIB | 505 | Methyl ethyl ketone (MEK) | T2 | https://referencesource.org/hazardous-area-substance-classification/505-iec-atex-methyl-ethyl-ketone-mek/ | [
"group",
"ignition_temperature_c",
"substance",
"temperature_class"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIA | iec-atex-n-hexane | null | [
"group"
] | https://exknowledge.com/pages/gas-groups.html | 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 | n-Hexane | null | https://referencesource.org/hazardous-area-substance-classification/iec-atex-n-hexane/ | [
"group",
"substance"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIA | 285-iec-atex-n-pentane | 285 | [
"group"
] | https://greenishco.com/Downloads/ATEX.pdf | n-pentane C5H12 285 T3 IIA | n-pentane | T3 | https://referencesource.org/hazardous-area-substance-classification/285-iec-atex-n-pentane/ | [
"group",
"ignition_temperature_c",
"substance",
"temperature_class"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIA | 430-iec-atex-nitrobenzene | 430 | [
"group"
] | https://greenishco.com/Downloads/ATEX.pdf | Nitrobenzene C6H5NO2 430 T1 IIA | Nitrobenzene | T1 | https://referencesource.org/hazardous-area-substance-classification/430-iec-atex-nitrobenzene/ | [
"group",
"ignition_temperature_c",
"substance",
"temperature_class"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIIB | 530-iec-atex-phenolic-resin | 530 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | Phenolic resin | IIIB | 530 | >450 | Phenolic resin | null | https://referencesource.org/hazardous-area-substance-classification/530-iec-atex-phenolic-resin/ | [
"group",
"ignition_temperature_c",
"layer_ignition_temperature_c",
"substance"
] | null | null | null | >450 |
IEC / ATEX | [
"classification_system"
] | IIIB | 420-iec-atex-polythene | 420 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | Polythene | IIIB | 420 | (melts) | Polythene | null | https://referencesource.org/hazardous-area-substance-classification/420-iec-atex-polythene/ | [
"group",
"ignition_temperature_c",
"layer_ignition_temperature_c",
"substance"
] | null | null | null | (melts) |
IEC / ATEX | [
"classification_system"
] | IIB | 371-iec-atex-propan-1-ol-n-propyl-alcohol | 371 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | Propan-1-ol (n-propyl alcohol) | T2 | IIB | 371 | Propan-1-ol (n-propyl alcohol) | T2 | https://referencesource.org/hazardous-area-substance-classification/371-iec-atex-propan-1-ol-n-propyl-alcohol/ | [
"group",
"ignition_temperature_c",
"substance",
"temperature_class"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIA | 399-iec-atex-propan-2-ol-iso-propyl-alcohol | 399 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | Propan-2-ol (iso-propyl alcohol) | T2 | IIA | 399 | Propan-2-ol (iso-propyl alcohol) | T2 | https://referencesource.org/hazardous-area-substance-classification/399-iec-atex-propan-2-ol-iso-propyl-alcohol/ | [
"group",
"ignition_temperature_c",
"substance",
"temperature_class"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIA | 470-iec-atex-propane | 470 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | Propane | T1 | IIA | 470 | Propane | T1 | https://referencesource.org/hazardous-area-substance-classification/470-iec-atex-propane/ | [
"group",
"ignition_temperature_c",
"substance",
"temperature_class"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIA | iec-atex-propane | null | [
"group"
] | https://exknowledge.com/pages/gas-groups.html | IIA | >0.90 | >0.80 | Methane, propane, butane, acetone, ethanol, benzene, diesel, ammonia | Propane | null | https://referencesource.org/hazardous-area-substance-classification/iec-atex-propane/ | [
"group",
"substance"
] | null | null | null | null |
NEC 500 (North America) | [
"classification_system"
] | Group D | nec-500-north-america-propane | null | [
"group"
] | https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf | Propane Group D | Propane | null | https://referencesource.org/hazardous-area-substance-classification/nec-500-north-america-propane/ | [
"group",
"substance"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIIB | 700-iec-atex-pvc | 700 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | PVC | IIIB | 700 | >450 | PVC | null | https://referencesource.org/hazardous-area-substance-classification/700-iec-atex-pvc/ | [
"group",
"ignition_temperature_c",
"layer_ignition_temperature_c",
"substance"
] | null | null | null | >450 |
IEC / ATEX | [
"classification_system"
] | IIIB | 810-iec-atex-soot | 810 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | Soot | IIIB | 810 | 570 | Soot | null | https://referencesource.org/hazardous-area-substance-classification/810-iec-atex-soot/ | [
"group",
"ignition_temperature_c",
"layer_ignition_temperature_c",
"substance"
] | null | null | null | 570 |
IEC / ATEX | [
"classification_system"
] | IIIB | 460-iec-atex-starch | 460 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | Starch | IIIB | 460 | 435 | Starch | null | https://referencesource.org/hazardous-area-substance-classification/460-iec-atex-starch/ | [
"group",
"ignition_temperature_c",
"layer_ignition_temperature_c",
"substance"
] | null | null | null | 435 |
IEC / ATEX | [
"classification_system"
] | IIIB | 490-iec-atex-sugar | 490 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | Sugar | IIIB | 490 | 460 | Sugar | null | https://referencesource.org/hazardous-area-substance-classification/490-iec-atex-sugar/ | [
"group",
"ignition_temperature_c",
"layer_ignition_temperature_c",
"substance"
] | null | null | null | 460 |
IEC / ATEX | [
"classification_system"
] | IIA | 535-iec-atex-toluene | 535 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | Toluene | T1 | IIA | 535 | Toluene | T1 | https://referencesource.org/hazardous-area-substance-classification/535-iec-atex-toluene/ | [
"group",
"ignition_temperature_c",
"substance",
"temperature_class"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIA | iec-atex-toluene | null | [
"group"
] | https://exknowledge.com/pages/gas-groups.html | 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 | Toluene | null | https://referencesource.org/hazardous-area-substance-classification/iec-atex-toluene/ | [
"group",
"substance"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIB | iec-atex-town-gas | null | [
"group"
] | https://exknowledge.com/pages/gas-groups.html | IIB | 0.50–0.90 | 0.45–0.80 | Ethylene, hydrogen sulphide, diethyl ether, ethylene oxide, town gas | Town gas | null | https://referencesource.org/hazardous-area-substance-classification/iec-atex-town-gas/ | [
"group",
"substance"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIA | 463-iec-atex-xylene | 463 | [
"group"
] | https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga | Xylene | T1 | IIA | 463 | Xylene | T1 | https://referencesource.org/hazardous-area-substance-classification/463-iec-atex-xylene/ | [
"group",
"ignition_temperature_c",
"substance",
"temperature_class"
] | null | null | null | null |
IEC / ATEX | [
"classification_system"
] | IIA | iec-atex-xylene | null | [
"group"
] | https://exknowledge.com/pages/gas-groups.html | 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 | Xylene | null | https://referencesource.org/hazardous-area-substance-classification/iec-atex-xylene/ | [
"group",
"substance"
] | null | null | null | null |
Gas group, temperature class and autoignition temperature by substance
Canonical, always-current version: https://referencesource.org/hazardous-area-substance-classification/ Machine-readable: https://referencesource.org/hazardous-area-substance-classification/data.json — this mirror is a point-in-time copy.
- Last verified: 2026-08-06
- Stale after: 2028-08-05 (past this date, prefer the canonical copy — it re-verifies on a cadence this snapshot does not)
- Records: 73
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.
Provenance — what every record carries
Every record carries source (the URL the value was read from) and
source_quote (a verbatim quote from that page stating it). A value you
cannot check against its page is indistinguishable from an invented one;
these can all be checked. Each record is also individually addressable on
the canonical site at its url.
Licence position
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.
Facts are not copyrightable; what this dataset takes from each source is a fact plus a short attributed quote linking back to the page that states it.
Sources
- https://www.e2s.com/guide-for-hazardous-areas/apparatus-groups-and-common-flammable-ga
- https://exknowledge.com/pages/gas-groups.html
- https://ldpi-inc.com/resources/classification-codes/class-1-locations/
- https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf
- https://greenishco.com/Downloads/ATEX.pdf
- https://www.cortemgroup.com/en/news/the-zones-of-the-plant-the-groups-and-the-temperature-classes-of-gases
Fields
See any record in data/records.jsonl — field names are self-describing,
and the canonical page for each record renders them with labels:
https://referencesource.org/hazardous-area-substance-classification/
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