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All About ... Rubber NATURAL  AND   SYNTHETIC  RUBBER A SELECTION GUIDE

Properties	NR	SBR	NBR	EPDM	CR	SILICONE	VITON
Hardness, A	30-95	40-95	40-95	30-85	30-90	40-80	50-95
Colours	Full	Full	Limited	Limited	Full	Limited	Limited
Cost Factor	1	1.5	2	2.5	3	8	15
Heat Resistance: Max Cont. Deg. C	75	85	100	130	95	205	205
Max. Intermittent Deg. C	105	115	130	150	125	300	300
Low Temp Resistance	-60	-55	-20	-50	-35	-60	-20
Oxidation Resistance	Fair	Fair	Good	Excellent	Very Good	Excellent	Out- standing
Ozone and Weathering	Poor	Fair	Fair	Out- standing	Very good	Out- standing	Out- standing
Oil Resistance	Poor	Poor	Excellent	Fair	Good	Excellent	Excellent
Solvent:  - Alcohol	Good	good	good	Good	Good	Good	Good
- Acetone	Fair	Fair	Poor	Good	Fair	Fair	Poor
- Benzene	Poor	Poor	Poor	Poor	Poor	Poor	Good
Chemical: - Acids	Good	Good	Good	Good	Good	Fair	Excellent
- Bases	Good	Good	Fair	Good	Fair	Fair	Good
Physical Strength	Excellent	Good	Good	Good	Good	Poor	Good
Compression Set	Good	Good	Good	Good	Good	Good	Good
Tear and Abrasion	Excellent	Good	Good	Good	Good	Poor	Good
Resilience	Excellent	Good	Good	Very good	Very Good	Fair	Poor
Gases Permeability	Poor	Fairly Low	Good	Fairly Low	Very Good	Good	Very Low
Electrical Strength	Excellent	Excellent	Poor	Excellent	Good	Excellent	Good
Flame Resistance	Poor	Poor	Poor	Poor	Self- Extinguishing	Good	Self- Extinguishion
Water Resistance	Very Good	Fair	Good	Excellent	Good	Good	Good

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