NFPA 497 Chemical (Vapor) Classifi cationGroup AAcetylene

Group BAcrolein (Inhibited)Allyl Glycidyl Ether1,3-Butadienen-Butyl Glycidyl EtherEthylene OxideFormaldehyde (Gas)HydrogenManufactured Gases containing at least 30% hydrogen (by volume)Propyl NitratePropylene Oxide

The information on this page is taken from NFPA 497 - Recommended Practice for the Classifi cation of Flammable Liquids, Gases, or Vapors and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas 2012. It is provided for reference only and is not to be used for design purposes. Only some of the materials listed here have been classifi ed by test. Refer to NFPA 497 for more detailed information on this table and a more complete explanation of material classifi cation.

Group DAcetic AcidAcetic Acid-Tert.-Butyl EsterAcetic AnhydrideAcetoneAcetone CyanohydrinAcetonitrileAcrylic AcidAcrylonitrileAdiponitrileAllyl ChlorideAlpha-Methyl StyreneAmmonian-Amyl Acetatesec-Amyl Acetatetert-Butyl AcetateAnilineBenzeneBenzyl ChlorideBromopropynen-ButaneButyleneButyl Acrylate (Inhibited)1-ButanolButyl alcohol (s) (butanol-2)ButylamineButylenen-Butyl Acetatesec-Butyl AcetateButyl-2-Propenoatepara tert.-Butyl Toluenen-Butyric AcidCarbon Disulfi deChlorobenzeneChloropreneCresolCumeneCyclohexaneCyclohexanolCyclohexanoneCyclohexeneCyclopropanep-CymeneDecenen-DecanolDecyl Alcohol

Diacetone AlcoholDi-IsobutyleneDi-Isobutyl Ketone1,4-Dichloro-2,3 Epoxybutane1,1-Dichloroethane1,2-Dichloroethylene1,3-DichloropropeneDiethyl BenzeneDimethyl FormamideDimethyl Sulfate2,2-Dimethylbutane2,3-Dimethylheptane3,3-Dimethylheptane2,3-Dimethylhexane2,3-DimethylpentaneDipenteneDodeceneEthaneEthanolEthylamineEthylenediamineEthylene ChlorohydrinEthylene DichlorideEthylene Glycol Monomethyl Ether2-Ethylhexanol2-Ethylhexyl AcrylateEthyl AcetateEthyl Acrylate (Inhibited)Ethyl AlcoholEthyl Sec-Amyl KetoneEthyl BenzeneEthyl ButanolEthyl Butyl KetoneEthyl ChlorideEthyl FormateEthyl SilicateFormic AcidFuel Oil 1Gasoline n-Heptanen-Heptenen-HexaneHexanoln-Hexanone

Hexenesec-Hexyl AcetateIsoamyl AcetateIsoamyl AlcoholIsobutaneIsobutyl AcetateIsobutyl AcrylateIsobutyl AlcoholIsohexaneIsopentaneIsophoroneIsopreneIsopropyl AcetateIsopropyl EtherIsopropylamineKerosoneLiquifi ed Petroleum GasMesityl OxideMethaneMethanolMethyl AcetateMethyl AcrylateMethyl AlcoholMethyl Amyl AlcoholMethyl ChlorideMethyl Ethyl KeotoneMethyl Formate2-MethylhexaneMethyl Isobutyl KeotoneMethyl IsocyanateMethyl MethacrylateMethyl N-Amyl KetoneMethyl Tertiary Butyl Ether2-MethylpropaneMethyl 1-PropanolMethyl 2-Propanol2-Methyl 5-Ethyl PyridineMethylamine2-MethylbutaneMethylcyclohexaneMethylcyclohexanol2-Methycyclohexanone2-Methylheptane3-Methylhexane2-Methylpropane

3-Methylpentane2 Methyl-1-Propanol2-Methyl-2-Propanol2-Methyloctane3-Methyloctane4-MethyloctaneMonoethanolamineMonoisopropanolamineNaptha (Coal Tar)Naptha (Petroleum)Neopentanenitrobenzenen-NonaneNoneneNonyl Alcoholn-OctaneOctenen-Octyl Alcoholn-Pentane1-Pentanol2-Pentanone1-Pentene2-Pentene2-Pentyl AcetatePhenylhydrazinePropane1-Propanol

2-PropanolPropiolactonePropionic AcidPropionic AnhydrideN-Propyl AcetatePropylenePropylene DichloridePyridineStyreneTetrahydrnaphthaleneToluenen-TrideceneTriethylbenzene2,2,3-Trimethylbutane2,2,4-Trimethylbutane2,2,3-Trimethylpentane2,2,4-Trimethylpentane2,3,3-TrimethylpentaneTriproppylamineTurpentinen-UndeceneVinyl AcetateVinyl ChlorideVinyl TolueneVinylidene ChlorideXylene

Group CAcetaldhydeAllyl Alcoholn-Butyraldehyden-Butyl FormalButyl MercaptanCarbon MonoxideChloroacetaldehyde1-Chloro-1-NitropropaneCrotonaldehyden-Decaldehyde1,1 Dichloro-1-NitroethaneDicyclopentadieneDiethylamineDiethylaminoethanolDiethyl EtherDiethylene Glycol Monobutyl EtherDiethylene Glycol Monomethyl

Ethern-n-Dimethyl AnilineDimethylamineDi-N- Propylamine1,4-DioxaneDipropylene Glycol Methyl EtherDiisopropylamineEpichlorohydrinEthyleneEthylenimineEthylene Glycol Monoethyl Ether AcetateEthylene Glycol Monobutyl Ether AcetateEthylene Glycol Monobutyl EtherEthylene Glycol Monoethyl Ether2-Ethylhexaldehyde

Ethyl Mercaptann-Ethyl Morpholine2-Ethyl-3-Propyl AcroleinFurfuralFurfuryl AlcoholHydrazineHydrogen CyanideHydrogen SelenideHydrogen Sulfi deIsobutyraldehydeIsodecaldehydeIsooctyl AldehydeIsopropyl Glycidyl EtherMethyl EtherMethyl FormalMethyl MercaptanMethylacetylene

Methylacetylene-PropadieneMethylalMonomethyl AnilineMonomethyl HydrazineMorpholineNitroethaneNitromethane1-Nitropropane2-NitropropanePropionaldehyden-Propyl EtherTetrahydrofuranTetramethyl LeadTriethylamineUnsymmetrical Dimethyl HydrazineValeraldehydeXylidine