Nickel Chloride	A	A	A	A	A	A	D	D	A	A	A
Nickel Nitrate		A	A	A	A	A	D		A	A	A
Nickel Sulfate	A	A	A	A	A	A	D	D	A	A	A
Nitrana (Ammonia Fertilizer)		B	B		C	A			A
Niter Cake	A	A	A	A	A	A
Nitric Acid (5-10% Solution)	A	D	D	B	A	A	D	D	A	A/120	A/120
Nitric Acid (20% Solution)	B	D	D	B	A	A	D	D	A	B/70	A
Nitric Acid (50% Solution)	C	D	D	D	A	A	D	D	A	B/70	A
Nitric Acid (Concentrated Solution)	C	D	D	D	B	A	D	D	A	D	A/72
Nitric Acid-Red Fuming	D	D	D	D	B	A	A	D	A	D	D
Nitrobenzene	A	D	D	C	B	A	C	A	B	A/72	A/70
Nitrobenzine		D		C	A	A
Nitro Ethane	A	C	D	B	C	A	A	A	A	C
Nitromethane	A	C	D	A	C	A	A	A	A	C	A/120
Nitrogen		A	A	A	A	A	A	A	A	A	A
Nitrogen Tetroxide		D	D	C	C	A	D	D		D	C
1-Nitropropane	D	C	D	A	D	A	A	A	A
Octadecane	B	B	A	D	A	A
N-Octane	B		A	D	A	A		A		D	A
Octyl Acetate	B		D		D	A	A		A
Octyl Alcohol (Octanol)		B	A	A	B	A	A	A	A
Octachloroluene	D	D	D	D	A	A	D	A		D
Oleic Acid	B	D	B	B	B	A	B	C	A	B	A
Olein (Triolein)		C	B			A
Oleum	D	D	C	D	A	A	D	D	A	D	D
Oleum Spirits	D	D	C	C	A	A	D	D	B	D	D
Olive Oil	B	B	D	A	A	A	A	A	A	A
O-Dichlorobenzene	D	D	D	D	A	A	D	A	A	D
Oxalic Acid (Cold)	A	B	B	A	A	A	C	D	A	A/70	A/120
Ozone	A	B	D	A	A	A				D	A
Paints & Solvents	B	D	D			A	A	A	A
Paint Thinner, Duco	C	C	A	D	B	A	A	A	A	D
Palm Oil	B	C	A		A	A		A	A
Palmetic Acid	B	B	A	B	A	A	C	C	A	A	A
Paraffin	C		A	D	A	A	A		A	A	A
Paraformaldehyde		B	B		C	A	A	A	A
Paraldehyde		B	C	A	D	A	A	A	A
Peanut Oil	B	B	A	D	A	A		A	A
Pentachloroethane Pentalin)	D	D	D		A	A	D	A	A
Pentachlorophenol (PCP)		D	D	D	A	A	D	A	A
Pentane	C	B	A	D	A	A	A	A	C
Peppermint Oil	C	D	D		A	A			A