Elastomeric Properties 1 | Akron Rubber Development Laboratory

Comparative Properties of Typical Commercial Elastomers

Polyisoprene, Styrene Butadiene, Isobutylene Isoprene, Polybutadiene, & Butadiene Acrylonitriles

Comparative Properties of Typical Commercial Elastomers
CHEMICAL NAME	Polyisoprene	Styrene Butadiene	Isobutylene Isoprene	Polybutadiene	Butadiene Acrylonitrile
COMMON NAME	Natural Rubber	SBR or GR-S or Buna S	Butyl	Butadiene	Nitrile (Buna N)
Material Designation (ASTM D 2000, SAE J 200 Classification)	AA	AA	AA	AA	BF, BG, BK, CH
Tensile Strength, Mpa (psi)
Pure Gum	Over 20.7 (3,000)	Below 6.9 (1,000)	Over 10.3 (1,500)	Below 6.9 (1,000)	Below 6.9 (1,000)
Black Loaded Stocks	Over 20.7 (3,000)	Over 13.8 (2,000)	Over 10.8 (2,000)	Over 10.8 (2,000)	Over 10.8 (2,000)
Hardness Range (Durom, A)	30-90	40-90	40-75	40-80	40-95
Specific Gravity (Base Material)	0.93	0.94	0.92	0.94	1.00
Adhesion to Metals	Excellent	Excellent	Good	Excellent	Excellent
Adhesion to Fabrics	Excellent	Good	Good	Good	Good
Tear Resistance	Good to Very Good	Fair	Good	Good	Fair
Abrasion Resistance	Excellent	Good to Excellent	Good	Excellent	Good
Compression Set	Good	Good	Fair	Very Good	Good
Rebound
Cold	Excellent	Good	Poor	Outstanding	Good
Hot	Excellent	Good	Very Good	Excellent	Good
Dielectric Strength	Excellent	Excellent	Excellent	Good	Poor
Electrical Insulation	Good to Excellent	Good to Excellent	Good to Excellent	Good to Excellent	Poor
Permeability to Gases	Fairly Low	Fairly Low	Very Low	Good	Low
Acid Resistance
Diluted	Fair to Good	Fair to Good	Excellent	Fair to Good	Good
Concentrated	Fair to Good	Fair to Good	Good	Fair to Good	Good
Solvent Resistance
Aliphatic Hydrocarbons	Poor	Poor	Poor	Poor	Excellent
Aromatic Hydrocarbons	Poor	Poor	Poor	Poor	Good
Oxygenated (Keytones, etc.)	Fair to Good	Good	Good	Poor	Poor
Laquer Solvents	Poor	Poor	Fair to Good	Poor	Fair
Resistance to
Swelling in Lubricating Oil	Poor	Poor	Poor	Poor	Very Good
Oil & Gasoline	Poor	Poor	Poor	Poor	Excellent
Animal & Vegetable Oils	Poor to Good	Poor to Good	Very Good	Poor	Very Good
Water Absorption	Very Good	Good to Very Good	Very Good	Very Good	Good
Oxidation	Good	Fair	Excellent	Good	Good
Ozone	Poor to Fair	Poor	Excellent	Poor	Fair
Sunlight Aging	Poor	Poor	Very Good	Poor	Poor
Heat Aging (Upper Limit Cont. Service)	85°C (185°F)	90°C (194°F)	120°C (248°F)		115°C (239°F)
Flame	Poor	Poor	Poor	Poor	Poor
Heat	Good	Fair to Good	Very Good	Fair	Good
Cold	Excellent	Very Good	Good	Very Good	Fair to Good