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H334 — May cause allergy or asthma symptoms or breathing difficulties if inhaled

Hazard class: Respiratory sensitization · Category 1, 1A, 1B

93 substances with this hazard classification

What does H334 mean?

Inhalation may cause allergic respiratory reactions including asthma symptoms and breathing difficulties.

Safety Guidance

Avoid breathing dust, fume, gas, mist, vapours, or spray. Use only in well-ventilated areas. Wear respiratory protection. If experiencing respiratory symptoms, call a poison center or doctor.

Substances with H334

SubstanceCAS NumberSignal Word
1,1-dimethylprop-3-ynylamine 2978-58-7 Danger
1-(1-isocyanato-1-methylethyl)-3-(1-methylethenyl)benzene 2094-99-7 Danger
1,1'-[methylenebis(sulphonyl)]diethylene 3278-22-6 Danger
1,1'-sulphinylbispropane 4253-91-2 Danger
1,2,3,6-tetrahydro-3,6-methanophthalic anhydride 826-62-0 Danger
1,2,3,6-tetrahydro-3-methylphthalic anhydride 5333-84-6 Danger
1,2,3,6-tetrahydro-4-methylphthalic anhydride 3425-89-6 Danger
1,2,3,6-tetrahydromethyl-3,6-methanophthalic anhydride 25134-21-8 Warning
1,2,3,6-tetrahydromethylphthalic anhydride 26590-20-5 Danger
1,2,3,6-tetrahydrophthalic anhydride 85-43-8 Danger
1-(2,3-epoxypropoxy)-2,2-bis[(2,3-epoxypropoxy)methyl]butane 3454-29-3 Warning
1,2-dichloro-3-isocyanatobenzene 41195-90-8 Danger
1-(3,4-epoxy-4-methylpentyl)-1-methylallyl acetate 41610-76-8 Danger
1,3,5-triazine-2,4-diamine 504-08-5 Danger
1,3,5-trichlorotrinitrobenzene 2631-68-7 Danger
1,3,5-tris[(2S and 2R)-2,3-epoxypropyl]-1,3,5-triazine-2,4,6... 59653-74-6 Danger
1,3,5-tris(oxiranylmethyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-tr... 2451-62-9 Danger
1,3,7,9-tetratert-butyl-11-fluoro-5-methyl-5H-benzo[d][1,3,2... 118337-09-0 Danger
1,3-bis(1-isocyanato-1-methylethyl)benzene 2778-42-9 Danger
1,3-bis(2,3-epoxypropoxy)butane 3332-48-7 Danger
1,3-bis(hydroxymethyl)-5,5-dimethylimidazolidine-2,4-dione 6440-58-0 Warning
1,3-bis(isocyanatomethyl)benzene 3634-83-1 Danger
1,3-dichloro-2-isocyanatobenzene 39920-37-1 Danger
1,3-dichloro-5,5-dimethylhydantoin 118-52-5 Warning
1,3-dichloro-5-isocyanatobenzene 34893-92-0 Danger
1-(4-azidophenyl)-2-bromoethan-1-one 57018-46-9 Danger
1,4-bis(isocyanatomethyl)cyclohexane 10347-54-3 Danger
1,4-diisocyanatocyclohexane 2556-36-7 Warning
1,4-dithioterephthalic acid 1076-98-8 Danger
1,4-naphthoquinone 130-15-4 Danger
1,5-naphthylene diisocyanate 3173-72-6 Danger
1-amino-6,7-dichloroanthraquinone 5355-88-4 Danger
1-(benzylthio)acetone 10230-69-0 Danger
1-(bromomethyl)-2,4-difluorobenzene 23915-07-3 Danger
(1-chloroethyl)benzene 672-65-1 Danger
1-[(dimethylamino)ethyl]-4-methylpiperazine 29589-40-0 Danger
1-(methoxymethyl)propyl isothiocyanate 85099-02-1 Danger
(1-methylethylidene)bis(4,1-phenyleneoxy-2,1-ethanediyl) bis... 24448-20-2 Danger
1-(p-iodophenyl)-5-(p-nitrophenyl)-3-phenylformazan 7781-49-9 Danger
(1S-cis)-2,2-dimethyl-3-(2-methylprop-1-enyl)cyclopropanecar... 26771-06-2 Danger
(1α,2α,3β,6β)-1,2,3,6-tetrahydro-3,6-methanophthalic anhydri... 2746-19-2 Danger
(2,4,6-trioxotriazine-1,3,5(2H,4H,6H)-triyl)tris(methyl-m-ph... 26603-40-7 Danger
(2-ethylhexanoato-O)(isodecanoato-O)nickel 84852-39-1 Danger
(2-ethylhexanoato-O)(isononanoato-O)nickel 85508-45-8 Danger
(2-ethylhexanoato-O)(neodecanoato-O)nickel 85135-77-9 Danger
(2H5)benzoic acid 1079-02-3 Danger
(2H)formaldehyde 1664-98-8 Danger
(2-methylallyloxy)benzene 5820-22-4 Danger
(2R-cis)-(3-methyloxiranyl)phosphonic acid, compound with 2-... 78964-85-9 Danger
(3-chloroprop-1-enyl)benzene 2687-12-9 Danger