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Substance CAS Number(s) Health Factors
HMX 2691-41-0 X
Hafnium 7440-58-6 X
Halothane 151-67-7 X
Haloxon 321-55-1  
Helium 7440-59-7 X
Heptachlor 76-44-8 X
Heptachlorodibenzodioxins (All Isomers)    
Heptachlorodibenzofurans (All Isomers) 38998-75-3; 55673-89-7; 67562-39-4; 69698-58-4; 70648-25-8 X
Heptane (n-Heptane) 142-82-5 X
1-Heptene 592-76-7  
n-Heptylamine 111-68-2  
Heroin 561-27-3 X
Hexachlorobenzene 118-74-1 X
Hexachlorobutadiene 87-68-3 X
Hexachlorocyclopentadiene 77-47-4 X
Hexachlorodibenzodioxins (All Isomers)    
Hexachlorodibenzofurans (All Isomers)    
Hexachloroethane 67-72-1 X
Hexachloronaphthalene 1335-87-1 X
Hexadeutorobenzene 1076-43-3  
Hexafluoroacetone 684-16-2 X
Hexahydrophthalic Anhydride 85-42-7  
Hexamethylcyclotrisiloxane 541-05-9 X
Hexamethyldisilazane 999-97-3  
Hexamethylenediamine 124-09-4 X
Hexamethylene Diisocyanate 822-06-0; 11142-52-2 X
Hexamethylene Diisocyanate Biuret 4035-89-6; 11142-52-2  
1,6-Hexamethylene Diisocyanate Homopolymer 28182-81-2  
Hexamethylenetetramine 100-97-0  
Hexamethyl phosphoramide 680-31-9 X
Hexane (n-Hexane) 110-54-3 X
Hexane, (Isomers other than n-Hexane)    
1,6-Hexanediol 629-11-8  
1,6-Hexanediol Diacrylate 13048-33-4  
2-Hexanone 591-78-6 X
Hexazinone 51235-04-2  
1-Hexene 592-41-6  
Hexone 108-10-1 X
n-Hexyl Acetate 142-92-7  
sec-Hexyl Acetate 108-84-9 X
Hexyl Alcohol 111-27-3  
Hexyl Carbitol 112-59-4  
Hexylamine 111-26-2  
Hexylene Glycol 107-41-5 X
Histoplasma species    
Holothurin 11029-72-4  
Hydramethylnon 67485-29-4  
Hydrazine 302-01-2 X
Hydrazoic Acid 7782-79-8 X
Hydrogen 1333-74-0 X
Hydrogenated Terphenyls 61788-32-7 X
Hydrogen Bromide 10035-10-6 X
Hydrogen Chloride 7647-01-0 X
Hydrogen Cyanide 74-90-8 X
Hydrogen Fluoride (as F) 7664-39-3 X
Hydrogen Peroxide 7722-84-1 X
Hydrogen Selenide (as Se) 7783-07-5 X
Hydrogen Sulfide 7783-06-4 X
Hydroquinone 123-31-9 X
m-Hydroxyacetophenone 121-71-1 X
Hydroxylamine 7803-49-8 X
m-Hydroxybenzoic Acid 99-06-9  
4-Hydroxycoumarin 1076-38-6 X
2-Hydroxycyclohexanone 533-60-8  
Hydroxyethyl Acrylate 818-61-1  
N-Hydroxyethylethylenediaminetriacetate Trisodium salt 139-89-9  
2-Hydroxyethyl Methacrylate 868-77-9  
N-(2-Hydroxyethyl)Morpholine 622-40-2  
2-Hydroxy-4-Methoxyacetophenone   X
3-Hydroxy-2-Naphthoic Acid 92-70-6  
2-Hydroxypropyl Acrylate 999-61-1