Elastomeric Properties 3

Comparative Properties of Typical Commercial Elastomers
CHEMICAL NAME	Polyacrylate	Fluoroalkyl Polysiloxane	Polysiloxane	Fluorinated Hydrocarbon	Fluoroelastomer	Perfluoroelastomer
COMMON NAME	Acrylic	Fluorosilicone	Silicone	Flurocarbon
Material Designation (ASTM D 2000, SAE J 200 Classification)	Not Assigned	FK	GE	HK	HK	FFKM
Tensile Strength, Mpa (psi)
Pure Gum	-	Below 10.3 (1,500)	Below 10.3 (1,500)	8.3 (1,200)	Over 12.4 (1,800)	Not Applicable
Black Loaded Stocks	Over 17.2 (2,500)	Over 10.3 (1,500)	Over 10.3 (1,500)	3.4 (500) - 20.7 (3,000)	Over 13.8 (2,000)	Over 13.8 (2,000)
Hardness Range (Durom, A)	40-95A	60-90	40-85	60-90	55-95	65-95A
Specific Gravity (Base Material)	1.08-1.12	1.30-2.20	1.14-2.05	1.80	1.85	2.01
Adhesion to Metals	Very Good to Excellent	Excellent	Excellent	Fair to Good	Fair to Good	Fair
Adhesion to Fabrics	Good	Excellent	Excellent	Good	Good to Excellent	Good
Tear Resistance	Good	Poor to Fair	Poor	Fair to Good	Fair	Fair
Abrasion Resistance	Good	Poor	Poor	Good	Good	Good
Compression Set	Good	Good	Fair	Very Good	Fair to Good (Except at High Temp)	Fair
Rebound
Cold	Poor	Excellent	Excellent	Fair	Fair to Good	Not Available
Hot	Fair	Excellent	Excellent	Good	Good (Except at High Temp)	Not Available
Dielectric Strength	Good	Good	Good	Very Good	Good	Excellent
Electrical Insulation	Fair to Good	Excellent	Excellent	Good	Fair to Good	Excellent
Permeability to Gases	Very Low	Fairly Low	Fairly Low	Very Low	Very Low	Fair
Acid Resistance
Diluted	Good	Excellent	Excellent	Good to Excellent	Excellent	Excellent
Concentrated	Poor	Fair	Fair	Excellent	Excellent	Excellent
Solvent Resistance
Aliphatic Hydrocarbons	Good	Excellent	Poor	Excellent	Excellent	Excellent
Aromatic Hydrocarbons	Fair	Excellent	Poor	Excellent	Excellent	Excellent
Oxygenated (Keytones, etc.)	Poor	Poor	Fair	Poor	Poor	Excellent
Laquer Solvents	Poor	Poor	Poor	Poor to Fair	Poor to Fair	Excellent
Resistance to
Swelling in Lubricating Oil	Good	Excellent	Fair	Excellent	Excellent	Excellent
Oil & Gasoline	Good	Excellent	Fair	Excellent	Excellent	Excellent
Animal & Vegetable Oils	Good	Excellent	Good to Excellent	Excellent	Excellent	Excellent
Water Absorption	Very Good up to 100°C (212°F)	Excellent	Excellent	Very Good	Very Good	Very Good
Oxidation	Outstanding	Excellent	Excellent	Outstanding	Outstanding	Outstanding
Ozone	Outstanding	Excellent	Excellent	Outstanding	Outstanding	Outstanding
Sunlight Aging	Outstanding	Excellent	Excellent	Outstanding	Outstanding	Outstanding
Heat Aging (Upper Limit Cont. Service)	165°C (329°F)		235°C (455°F)		205°C (401°F)	290°C (554°F)
Flame	Poor	Excellent	Fair to Good	Excellent	Excellent	Excellent
Heat	Excellent	Outstanding	Outstanding	Outstanding	Outstanding	Very Outstanding
Cold	Good	Outstanding	Outstanding	Fair to Good	Good	Good