A - little or no action B - moderate action C - strong action S - unknown FLUID OR MATERIAL CONVEYED NR NBR EPDM HYPALON® Octadecanoic acid C A/B C S Octane C A C S Octanol B B B B Octyl acetate C S B C Octyl alcohol B S B S Octyl aldehyde C S S C Octyl amine B S B C Octyl carbinol A A A A Octylene glycol A A A A Oil ? petroleum C A C B/C Oleic acid C B S C Oleum C C C C Olive oil C A S C Orthodiclorobenzene C C C C Orthodiclorobenzol C C C C Orthoxylene C C C C Oxalic acid C C A C Oxygen B B A A Ozone C C A B