Elastomeric Properties 2

Comparative Properties of Typical Commercial Elastomers
CHEMICAL NAME	Polychloroprene	Chlorinated Ployethylene	Polyester/Ether Urethane	Ethylene Propylene	Chlorosulphanated Polyethylene	Polyalkylene Oxide
COMMON NAME	Neoprene	CPE	Urethane	EPDM	Hypalon®	Epichlorohydrin
Material Designation (ASTM D 2000, SAE J 200 Classification)	BC, BE	BC, BE, CE	BG	CA	CE	CH
Tensile Strength, Mpa (psi)
Pure Gum	Over 20.7 (3,000)	Over 10.3 (1,500)	Over 27.6 (4,000)	Below 6.9 (1,000)	Over 17.2 (2,500)	Below 6.9 (1,000)
Black Loaded Stocks	Over 20.7 (3,000)	Over 17.2 (2,500)	-	Over 20.7 (3,000)	Over 20.7 (3,000)	Over 17.2 (2,500)
Hardness Range (Durom, A)	40-95	60-90	60-99+A (up to 80D)	40-90	40-95	40-90
Specific Gravity (Base Material)	1.23	1.16-1.32	1.06	0.86	1.12-1.28	1.36-1.27
Adhesion to Metals	Excellent	Fair to Good	Good to Excellent	Good to Excellent	Excellent	Fair to Good
Adhesion to Fabrics	Excellent	Fair	Very Good to Excellent	Good	Good	Fair to Good
Tear Resistance	Good	Fair	Excellent	Fair to Good	Fair	Fair to Good
Abrasion Resistance	Excellent	Good	Outstanding	Good to Excellent	Excellent	Fair to Good
Compression Set	Fair to Good	Good	Fair	Good	Fair	Poor
Rebound
Cold	Very Good	Fair	Good (Poor at Low-Temp)	Very Good	Fair to Good	Good
Hot	Very Good	Good	Good at Room Temp.	Very Good	Good	Good
Dielectric Strength	Good	Excellent	Excellent	Excellent	Very Good to Excellent	Good
Electrical Insulation	Fair to Good	Good	Fair to Good	Excellent	Good	Good
Permeability to Gases	Low	Very Low	Failry Low	Failry Low	Low to Very Low	Low to Fairly Low
Acid Resistance
Diluted	Excellent	Excellent	Fair	Excellent	Excellent	Fair to Good
Concentrated	Good	Good	Poor	Excellent	Very Good to Excellent	Fair
Solvent Resistance
Aliphatic Hydrocarbons	Fair to Good	Good	Good to Excellend	Poor	Fair to Good	Excellent
Aromatic Hydrocarbons	Fair	Fair	Fair to Good	Poor	Fair	Good
Oxygenated (Keytones, etc.)	Poor	Fair	Poor	Good to Very Good	Poor to Fair	Poor
Laquer Solvents	Poor	Fair	Poor	Poor to Fair	Poor	Fair
Resistance to
Swelling in Lubricating Oil	Good	Good	Good to Excellend	Poor	Good to Excellent	Excellent
Oil & Gasoline	Good	Good	Good to Excellend	Poor	Good	Excellent
Animal & Vegetable Oils	Good	Good	Good to Excellend	Good	Good	Excellent
Water Absorption	Good	Very Good	Good at Room Temp/Poor at 100°C (212°F)	Very Good to Excellent	Very Good	Good
Oxidation	Very Good to Excellent	Excellent	Excellent	Excellent	Excellent	Good
Ozone	Very Good to Excellent	Excellent	Excellent	Outstanding	Outstanding	Excellent
Sunlight Aging	Very Good	Outstanding	Good	Outstanding	Outstanding	Good
Heat Aging (Upper Limit Cont. Service)	95°C (203°F)	120°C (248°F)	85°C (185°F)	145°C (293°F)	135°C (275°F)	135°C (275°F)
Flame	Good	Good	Fair (Will Melt)	Poor	Good	Poor to Fair
Heat	Very Good	Good	Good	Excellent	Excellent	Very Good
Cold	Good	Very Good	Excellent	Excellent	Good	Good to Very Good