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Substance CAS Number(s) Health Factors
Octabromodiphenyl Ether 32536-52-0  
1,2,3,4,6,7,8,9-Octachlorodibenzodioxin
 3268-87-9  
Octachlorodibenzodioxins (All except 1,2,3,4,6,7,8,9-OCDD)    
Octachlorodibenzofurans (All Isomers)    
Octachloronaphthalene 2234-13-1 X
Octadecanol 112-92-5  
Octamethylcyclotetrasiloxane 556-67-2  
Octane 111-65-9 X
1-Octanethiol 111-88-6  
Octanoic acid 124-07-2 X
Octanol 111-87-5  
1-Octene 111-66-0  
trans-2-Octene 13389-42-9  
trans-3-Octene 14919-01-8  
trans-4-Octene 14850-23-8  
Oil Mist, Mineral 8012-95-1 X
Orthene 30560-19-1  
Oryzalin 19044-88-3  
Osmium Tetroxide (as Os) 20816-12-0 X
Oxalic Acid 144-62-7 X
2,2'-Oxybis-(N,N-Dimethylethylamine) 3033-62-3  
Oxydemeton-Methyl 301-12-2  
4,4'-Oxydianiline 101-80-4 X
Oxygen 7782-44-7 X
Oxygen Difluoride 7783-41-7 X
Ozone 10028-15-6 X