Methyl Bromide	D	D	B	A	A	A	D			D	A
Methyl Butyl Ketone	C	D	D	A	D	A	A	A	A	D	D
Methyl Cellosolve	B	D	D	B	D	A	A	A		B	A
Methyl Chloride	D	D	D	C	A	A	D	B	A	D	A
Methyl Cyclopentane	D	C	B	D	A	A
Methyl Dichloride	D	D	D		A		D			D	A
Methyl Ethyl Ketone	B	D	D	A	D	A	A	A	A	C	D
Methyl Formate	B	B	D	A	D	A	A	B	B
Methyl Hexane		A	A	D	A	A
Methyl Iodide	A	D	D	A		A	A	A	A
Methyl Isobutyl Ketone	C	D	D	B	D	A		A	A	B/72	D
Methyl Isopropyl Ketone	C	D	D	C	D	A		A	A	C	D
Methyl Methacrylate	B	D	D	C	D	A				A	B
Methyl Oleate	C	D	D	C	B	A		A
Methyl Propyl Ketone	C	D	D	B	D	A		A
Methyl Salicylate	B	D	D	C	B	A	A	A		B	B
Methylene Bromide		D	D		B	A		A	A
Methylene Chloride	D	D	D	C	B	A	D	B	A	D	B/72
Milk	A	A	A	A	A	A	A	D	A	A	A
Mine Water	B		A			A	B		B
Mineral Oil (Petroleum)	C	B	A	D	A	A	A	A	A	B	A
Mixed Acids (Sulfuric & Nitric)		D	D	B	A	A	D	D	B	D
Molasses	A	A	A	A	A	A	A	A	A	A	A
Monochlorobenzene	D	D	D	D	D	A	D	A	A	D	A/150
Monomethyl Aniline		D	D	D	C	A		A		C
Monoehtanolamine	A	C	B	B	C	A	B	A	A	B	C
Monomethylether	D	B	A	A	A	A
Monovinyl Acetylene		B	A	A	A	A
Mustard	A	C	B		A		B	C	A	A
Mustard Gas		A		A	A	A
Naptha	C	D	B	D	A	A	A	B	A	C	A
Napthalene	C	D	D	D	A	A	B	B	B	A/70	A
Napthenic Acid	D		B	D	A	A	B	B	A
Natural Gas	C	A	A	C	A	A	A	A	A	A
Neatsfoot Oil	B		A	B	A	A	A	A	A
Neohexane			A		A	A
Neosol		A	A	B	C	A	B	B	A
Neville Acid	A	C	C	B	A	A
Nickel Acetate	A	B	B	A	A	A	D