Base Polymer Selection Guide
		Physical Properties
		Hardness Range	Low Service Temp	High Service Temp	Abrasion	Strength	Resilience
		(Shore A)	(F)	(F)			(Rebound)
Polymer types
General Purpose
Natural Rubber	NR	20 to 100 A	-75	+200 to +250	E	G to E	E
Polyisoprene	IR	30 to 100 A	-60	+180	E	G to E	E
Styrene Butadiene Rubber	SBR	30 to 100 A	-75	+250	E	F to E	P to E
Polybutadiene Rubber	BR	45 to 95 A	-150	+200	E	G to E	F to E
Ethylene Propylene Rubber	EPDM	20 to 100 A	-75	+350	G to E	G to E	F to VG
Butyl	IIR	30 to 100 A	-75	+300	F to G	G	P to F
Oil Resistant
Butadiene Acrylonitrile (Nitrile)	NBR	20 to 100 A	-40 to -70	+250 to +300	G to E	G to E	G
Polychloroprene (Neoprene)	CR	20 to 100 A	-80	+275	VG to E	G to E	VG
Chlorosulfonated Polyethylene (Hypalon®)	CSM	30 to 100 A	-65	+275 to +300	VG to E	F to G	F to G
Polyurethane	AU, EU	30 to 100 A	-65	+250	E to O	E	P to VG
Epichlorhydrin	CO, ECO	20 to 100 A	-15 to -80	+225 to +325	F to G	F to E	G to VG
Specialty
Carboxylated Nitrile	XNBR	20 to 100 A	-40	+250 to +300	VG to E	G to E	G
Hydrogenated Nitrile	HNBR	55 to 100 A	-40	+350	E to O	F to G	G
Silicone	SI	30 to 100 A	-175	+600	P to G	P to G	G to E
Polysulfide (Thiokol)	T	20 to 100 A	-50 to -75	+250	P to F	P to F	P to F
Fluoroelastomers (Viton®)	FMK	50 to 95 A	-20 to -70	+550 to +650	G	P to E	G
Polyacrylate	ACM	40 to 90 A	-40	+400	P to F	P to G	F to G
Nitrile / PVC blend	NBR/PVC	20 to 100 A	-30	+250	VG to E	G to E	P to G
	KEY
	O -	Out standing	G -	Good
	E -	Excellent	F -	Fair
	VG -	Very Good	P -	Poor
Note: All properties listed above for a particular polymer may not be available in a single compound.

Hypalon® and Viton® are the registered trademarks of DuPont Dow Elastomers.