A - little or no action B - moderate action C - strong action S - unknown FLUID OR MATERIAL CONVEYED NR NBR EPDM HYPALON® M.E.K. C S B C Magnesium acetate C S S S Magnesium chloride A A A A Magnesium hydrate B B S B Magnesium hydroxide B B A B Magnesium sulfate A A A A Maleic acid C C C C Maleic anhydride C C C C Malic acid B S S B Manganese sulphate B S A A Manganese sulphite B S A A Mercury A S A A Mesityl oxide C S B S Methallyl alcohol A A A A Methanecarboxylic acd C S C S Methanoic acid C S S S Methanol A A A A Methoxy ethanol C S S S Methyl 1,2-pentanediol C S S S Methyl acetate C S B C Methyl acetone C S B C Methyl alcohol A A A A Methyl allyl acetate C S S S Methyl allyl alcohol S S S S Methyl allyl chloride C S S S Methyl amyl acetate C S S S Methyl amyl carbinol A S A A Methyl benzene C C C C Methyl bromide C C C C Methyl butane C B C S Methyl butanol A A A A Methyl butyl ketone C S B S Methyl carbitol C S S S Methyl cellosolve C C B C Methyl chloride C B/C C C Methyl cyclohexane C B/C C C Methyl ethyl ketone C S B C Methyl hexanol A A A A Methyl hexanone C C B C Methyl isobut carbinol B S A C Methyl isobutyl cheton C C C S Methyl methacrylate C S C C Methyl n amyl chetone C S S S Methyl propyl ether C S S S Methyl salicylate C S S S Methyl ter butyl ether C S S S Methylene bromide C C C C Methylene bromide C C C C Methylene chloride C C C C Methylene chloride C C C C Mineral spirits C A C S Molten sulphur B C B B Monobutyl ether C S C S Monochloroacetic acid B C S C Monochlorobenzene C C C C Monoclhorodifluormet C S C S Monoethanol amine A B A B Monoethyl amine S S B B MTBE (ter butyl metil Ether) C S S S Muriatic acid A S B S