Base Polymer Selection Guide
		Aged Properties
		Compression Set	Flex Cracking	Sunlight (UV)	Ozone	Heat
Polymer types
General Purpose
Natural Rubber	NR	E	E	P	P	F to G
Polyisoprene	IR	E	E	P	P	F to G
Styrene Butadiene Rubber	SBR	G to E	G	P	P	G
Polybutadiene Rubber	BR	G	F to E	P	P	F to G
Ethylene Propylene Rubber	EPDM	P to G	G to VG	O	G to E	G to O
Butyl	IIR	P to G	G to E	E	E	G to E
Oil Resistant
Butadiene Acrylonitrile (Nitrile)	NBR	G to E	G	P	P to F	G
Polychloroprene (Neoprene)	CR	P to G	G to VG	G to VG	VG to E	G to E
Chlorosulfonated Polyethylene (Hypalon®)	CSM	P to F	F to VG	E to O	E to O	G to E
Polyurethane	AU, EU	P to G	G to E	VG to E	E	G
Epichlorhydrin	CO, ECO	G to E	VG	G	G to E	F to G
Specialty
Carboxylated Nitrile	XNBR	G to E	G	P	P to F	G
Hydrogenated Nitrile	HNBR	G to E	G	G to VG	G to E	E
Silicone	SI	G to E	F to G	E	E to O	E to O
Polysulfide (Thiokol)	T	P to F	P to G	G	G to E	F to G
Fluoroelastomers (Viton®)	FMK	G to E	G	G to O	O	O
Polyacrylate	ACM	P to F	F to G	G to E	G to E	E
Nitrile / PVC blend	NBR / PVC	F to G	G to G	G to E	G to E	F to G
KEY
O -	Out standing	G -	Good
E -	Excellent	F -	Fair
VG -	Very Good	P -	Poor

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