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l l D Group 1 3 TENTATIVE CLASSIFICATION OF GASES AND VAPORS BY CHEMICAL FAMILIES (Compounds listed have already been classified by NEC/UL) Aliphatic hydrocarbons: methane, ethers, propane, butane, n-pentane, iso-pentane, iso-hexane, n-heptane, octane Alicyclic hydrocarbons with larger rings: (cf. cyclopentadiene - 1, 3 -- B (D), and cyclopropane -- Ct) Higher olefins: propylene, isoprene, diisobutylene (cf. butadiene -- B (D), and dicyclopentadiene -- Ct) Aromatic hydrocarbons: benzene, toluene, xylenes, styrene Alcohols: methyl, ethyl, propyl, butyls, amyls (cf. allyl-- C) Phenols Ketones b acetone, butanone, methyl isobutyl ketone, mesityl oxide (cf. ketone-- Ct) Organic acids and anhydrides: acetic acid Esters: ethyl acetate, isobutyl acetate, vinyl acetate, ethyl acrylate (cf. propiolactone-- C*) Ethers not containing ~-CH2 or ACHY: isopropyl ether Glycols ant] their esters Chlorinated hydrocarbons: ethylene chloride Primary amines: ethyl mine, ethylenediamine Delano! amines Aromatic hydrazines Aromatic nitro compounds: (cfo dinitrotoluene -- C) Cyanides, nitrites, i socyanates: acrylonitrile Aromatic heterocyclic nitrogen compounds: pyridine Amides Organo phosphates Organo sulfates and sulfones 1 8 .
1 4 C Group Higher acetylenes: methyl acetylene (cf. acetylene -- A) Small unsaturated alcohols: allyl Aldehydes; acetaldehyde, n-butyraldehy~le, (cfo formaldehyde -- B*t, and acrolein -- B (~) Ethers containing ~-CH2 or ~-CH3: ethyl ether Glycol ethers Cyclic ethers larger than 3-membered ring (but including epichiorohydrin -- C) Secondary and tertiary amines: cliethylamine, triethylam~ne Aliphatic nitro compounds: 2-nitropropane Aliphatic heterocyclic nitrogen compounds: ethylene imine Organo lead compounds Mercaptans and sulfides; hydrogen sulfide (cf. carbon bisulfide -- A) B (C) Group: Ethers, 3-membered ring: ethylene oxide, propylene oxide NOTE: Groups A, B. and B (D) are not included because no chemical families for these groups could be established.
