ESI Compound Properties

Properties	Natural	S B R	EPDM	Neoprene	Nitrile or Buna N	Silicone	Hypalon	Urethane
Tensile Strength	Excellent	Good	Excellent	Excellent	Good	Poor	Excellent	Excellent
Hardness Range Shore A	30-100	30-100	25-80	15-80	17-100	40-70	40-75	22-45 Cast 30-85 Wrapped
Tear Resistance	Good	Fair	Good	Good	Fair	Poor	Fair	Excellent
Abrasive Resistance	Excellent	Excellent	Good	Excellent	Good	Fair	Excellent	Out- Standing
Compression Set	Good	Good	Good	Fair-Good	Good	Good	Fair	Good
Rebound:	Natural	S B R	EPDM	Neoprene	Nitrile or Buna N	Silicone	Hypalon	Urethane
Cold	Excellent	Good	Excellent	Very Good	Good	Excellent	Good	Good at Room Temp
Hot	Excellent	Very Good	Excellent	Very Good	Good	Excellent	Good	Poor at 50 degrees
Dielectric Strength	Excellent	Excellent	Excellent	Good	Poor	Excellent	Excellent	Excellent
Electric Insulation	Good- Excellent	Good- Excellent	Good	Fair-Good	Poor	Excellent	Good	Fair
Permeability to Gases	Fair	Very Low	Fair-Good	Low	Fair	Good	Low	Fair
Acid Resistance Dilute	Fair-Good	Fair-Good	Good- Excellent	Excellent	Good	Fair	Very Good	Poor
Acid Resistance Concentrated	Fair-Good	Fair-Good	Good- Excellent	Good	Good	Fair	Very Good	Poor
Solvent Resistance:	Natural	S B R	EPDM	Neoprene	Nitrile or Buna N	Silicone	Hypalon	Urethane
Aliphatic Hydrocarbons	Poor	Poor	Poor	Good	Excellent	Poor	Good	Excellent
Aromatic Hydrocarbons	Poor	Poor	Poor	Fair	Good	Poor	Fair	Good
Oxygenated (Keytones & Acetates)	Good	Good	Good	Poor	Poor	Fair	Poor	Poor
Laquer Solvents	Poor	Poor	Good	Poor	Fair	Poor	Poor	Poor
Lubricating Oil	Poor	Poor	Poor	Good	Very Good	Good	Good- Excellent	Excellent
Gasoline & Oil	Poor	Poor	Poor	Good	Excellent	Poor	Good	Excellent
Vegetable Oils	Poor-Good	Poor	Good	Good	Excellent	Good	Good	Excellent
Water Absorption:	Very Good	Very Good	Very Good	Good	Fair-Good	Good	Very Good	Good at 70 degrees poor at 121 degrees
Resistance to:	Natural	S B R	EPDM	Neoprene	Nitrile or Buna N	Silicone	Hypalon	Urethane
Oxidation	Good	Good	Excellent	Excellent	Good	Excellent	Excellent	Excellent
Ozone	Fair	Poor	Excellent	Excellent	Fair	Excellent	Out- Standing	Out- Standing
Sunlight Aging	Poor	Fair	Very Good	Very Good	Poor	Excellent	Out- Standing	Good
Heat Aging	Good	Excellent	Excellent	Excellent	Excellent	Excellent	Excellent	Good
Flame	Poor	Poor	Poor	Good	Poor	Fair	Good	Good
Heat	Good	Very Good	Excellent	Excellent	Very Good	Good	Excellent	Fair
Cold	Excellent	Good	Excellent	Good	Good	Excellent	Good	Excellent
Major Attributes	Several	Resistance to Abrasion	General Purpose	Oil Resistance Weatherability	Oil Resistance	Heat Resistance and Release	Weatherability	Abrasion Resistance