A - little or no action B - moderate action C - strong action S - unknown
FLUID OR MATERIAL CONVEYED	NR	NBR	EPDM	HYPALON^Ž
Halon 1211	S	A	S	S
Helium	A	A	A	A
Heptanal	C	S	S	C
Heptane	C	A	C	S
Heptane carboxyl.acid	C	S	S	B
Hexaldehyde	C	S	A	C
Hexane	C	A	C	C
Hexanol	A	A	A	A
Hexene	C	B	C	B
Hexyl alcohol	A	A	A	A
Hexyl methyl ketone	C	C	S	C
Hexylamine	B	B	S	C
Hexylene glycol	A	A	A	A
Hydraulic oil	C	A	C	B
Hydrazine	C	C	C	A
Hydrobromic acid	A	C	A	A
Hydrocl. ac.37%(cold)	B	S	A	B
Hydrocl. ac.37%(hot)	C	S	C	C
Hydrocloric acid 15%	A	S	A	A
Hydrocyanic acid	C	S	S	C
Hydrofluoric acid cold	C	S	C	A
Hydrofluoric acid hot	C	S	C	C
Hydrofluosilicic acid	C	S	B	A
Hydrogen dioxide 10%	C	S	S	B
Hydrogen gas	B	A	S	B
Hydrogen perox. >10%	C	S	S	C
Hydrogen perox. 10%	C	S	S	B
Hydrogen sulfide	C	C	B	C