Material Guide

Properties	Nitrile	Natural	EPDM	Neoprene	Viton	Silicone	Butyl	SBR
Abbreviation	NBR	NR	EPDM	CR	FKM	VMQ	IIR	SBR
Hardness Shore A	40 - 95	40 -95	40 - 90	40 - 90	40 - 90	20 - 80	40 - 80	40 - 80
Temperature
Max continuous °C	100	80	100	100	205	210	110	85
Max intermittant °C	125	100	125	120	250	260	120	115
Low temp' °C	-40	-40	-45	-40	-20	-60	-40	-55
Resistance
Oxidation	Good	Fair	Excellent	Very good	Excellent	Excellent	Excellent	Fair
Ozone & weathering	Fair	Poor	Excellent	Good	Excellent	Excellent	Excellent	Fair
Oil	Excellent	Poor	Poor	Good	Excellent	Poor	Poor	Poor
Flame retardance	Poor	Poor	Good	Excellent	Excellent	Good	Poor	Poor
Water	Good	Fair	Excellent	Good	Good	Good	Very good	Fair
Solvents
Alcohol	Good	Good	Good	Good	Good	Good	Fair	Good
Acetone	Poor	Fair	Good	Fair	Poor	Fair	Good	Fair
Acids	Good	Good	Good	Good	Excellent	Fair	Good	Good
Bases	Fair	Good	Good	Fair	Good	Fair	Fair	Good
Other
Physical strength	Good	Excellent	Good	Good	Good	Poor	Good	Good
Compression set	Good	Good	Good	Good	Good	Good	Fair	Good
Tear & Abrasion	Good	Excellent	Good	Good	Good	Poor	Good	Good
Resilience	Good	Excellent	Very good	Very good	Poor	Fair	Good	Good
Gas permiability	Good	Poor	Low	Very good	Very low	Good	Very low	Low
Electrical strength	Poor	Excellent	Excellent	Good	Good	Excellent	Excellent	Excellent