Standard	Semi-Standard
	SBR	Polyisoprene (Natural Rubber)	EPDM	Neoprene	Buna-N (Nitrile)	Fluoro-elastomer (Viton™)	Silicone
ASTM D-2000/SAE J200 Class	AA, BA	AA	AA, BA, CA, DA	BC, BE	BF, BG, BK	HK	FC, FE, GE
Standard Durometer	60	50	60	60	50	60	50
Custom Durometer	40,50,70,80	40,60,70,80	40,50,70,80	40,50,70,80	40,60,70,80	40,50,70,80	40,60,70,80
Service Temperature Range Min/Max	-60°F/-65°C	-60°F/-65°C	-70°F/-71°C	-40°F/-65°C	-60°F/-65°C	-25°F/-46°C	-178°F/-131°C
	180°F/68°C	180°F/68°C	300°F/135°C	225°F/93°C	250°F/107°C	500°F/246°C	550°F/274°C
Tensile Strength, Max/psi	2500	3500	2500	3000	3000	2000	1000
General Properties (for comparison purposes)
Resilience	G	E	G	E	F	F	G
Impact Strength	E	E	G	E	G	G	F
Abrasion Resistance	E	E	G	E	E	G	P
Tear Resistance	F	E	F	G	G	G	F
Oil Resistance	P	P	P	E	E	E	G
Fuel Resistance	P	P	F	G	E	E	P
Weather Aging	F	F	E	G	G	E	E
Oxidation	F	F	E	E	F-G	E	E
Heat Aging	G	G	E	E	G	E	E
Water Swell Resistance	E	F	E	G	E	E	E
Flame Resistance	P	P	P	E	P	E	E
Adhesion To Metal	E	E	G	E	G	G	E
Electrical Resistivity	E	E	E	F	F	G	E