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Substance CAS Number(s) Health Factors
Nadic methyl anhydride 25134-21-8 X
Naphtha (Coal Tar) 8030-30-6 X
Naphthalene 91-20-3 X
1,5-Naphthalene Diisocyanate 3173-72-6  
beta-Naphthol 135-19-3 X
alpha-Naphthylamine 134-32-7 X
beta-Naphthylamine 91-59-8 X
1-Naphthylisothiocyanate 551-06-4  
Neodymium (as Nd) 7440-00-8  
Neon 7440-01-9 X
Neurospora species   X
Nickel Carbonyl 13463-39-3 X
Nickel, Metal and Insoluble compounds (as Ni) 7440-02-0; 12035-72-2 (Nickel subsulfide) X
Nickel, Soluble Compounds (as Ni) 7440-02-0 X
Nicotine 54-11-5 X
Nigrospora species   X
Nitric Acid 7697-37-2 X
Nitric Oxide 10102-43-9 X
o-Nitroaniline 88-74-4  
p-Nitroaniline 100-01-6 X
Nitrobenzene 98-95-3 X
para-Nitrobenzyl Bromide 100-11-8  
p-Nitrochlorobenzene 100-00-5 X
4-Nitrodiphenyl 92-93-3 X
Nitrocellulose 9004-70-0 X
N-Nitrodimethylamine 4164-28-7 X
4-Nitrodiphenylamine 836-30-6  
Nitroethane 79-24-3 X
5-Nitro-2-furaldehyde Semicarbazone 59-87-0 X
Nitrogen 7727-37-9 X
Nitrogen Dioxide 10102-44-0 X
Nitrogen Trichloride 10025-85-1 X
Nitrogen Trifluoride 7783-54-2 X
Nitroglycerin 55-63-0 X
Nitromethane 75-52-5 X
p-Nitrophenol 100-02-7 X
1-Nitropropane 108-03-2 X
2-Nitropropane 79-46-9 X
1-Nitropyrene 5522-43-0 X
N-Nitrosodiamylamine 13256-06-9 X
N-Nitrosodibutylamine 924-16-3 X
N-Nitrosodiethanolamine 1116-54-7 X
N-Nitrosodiethylamine 55-18-5 X
N-Nitrosodiisopropanolamine 53609-64-6 X
N-Nitrosodiisopropylamine 601-77-4  
N-Nitrosodimethylamine 62-75-9 X
N-Nitrosodiphenylamine 86-30-6 X
N-Nitrosodipropylamine 621-64-7 X
N-Nitrosoethyl-n-butylamine 4549-44-4  
N-Nitrosomethyl-n-butylamine 7068-83-9  
N-Nitrosomethylethylamine 10595-95-6 X
N-Nitrosomorpholine 59-89-2 X
N-Nitrosopiperidine 100-75-4 X
N-Nitroso-N-propyl-n-butylamine 25413-64-3  
N-Nitrosopyrrolidine 930-55-2 X
Nitrotoluene 99-08-1; 88-72-2; 99-99-0 X
Nitrous oxide 10024-97-2 X
Nonane 111-84-2 X
Non-sporulating fungi   X
Nonyl Alcohol 143-08-8  
Nonylphenol 25154-52-3  
Norethindrone 68-22-4  
Nylon 63428-83-1