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O-ring and elastomer properties

Here are o-ring and elastomeric property guidelines for common o-ring compounds including high and low temperature gaskets and seals, water resistance, ozone resistance and gas impemeability and other physical properties of o-rings.

Generic Elastomeric Properties

Physical Property	Butyl	Ethylene Propylene EPDM	Flouro-carbon FKM	Natural Rubber NR	Neoprene CR	Nitrile Butadiene NBR	Silicone VMQ	Styrene Butadiene SBR	Urethane
Polymer Specific Gravity	0.9	0.88	1.4-1.9	0.93	1.23	1	0.95	0.93	1.05
Durometer Limits	30-100	40-90	65-90	30-100	20-90	40-100	25-80	30-100	30-100
Tensile Strength, PSI	0-1900	0-2400	0-2000	0-3200	0-3000	0-3000	0-1450	0-3000	0-8000
Elongation %	0-625%	0-500%	0-300%	0-700%	0-800%	0-700%	0-700%	0-500%	0-600%
Tear Resistance	Fair	Fair	Fair	Very Good	Good	Good	Good	Good	Very Good
Weather Resistance	Very Good	Very Good	Very Good	Fair	Very Good	Fair	Very Good	Fair	Very Good
Ozone Resistance	Very Good	Very Good	Very Good	Poor	Very Good	Poor	Very Good	Poor	Very Good
Water Resistance	Very Good	Very Good	Good	Very Good	Good	Very Good	Good	Very Good	Fair
Oil & Gasoline Resistance	Poor	Poor	Very Good	Poor	Good	Very Good	Poor	Poor	Very Good
Solvent Resistance: Aliphatic Hydrocarbons	Poor	Poor	Very Good	Poor	Good	Very Good	Poor	Poor	Very Good
Solvent Resistance: Aromatic Hydrocarbons	Poor	Fair	Very Good	Poor	Poor	Good	Poor	Poor	Fair
Brittle Point (°F)	-80	-80	-60	-80	-50	-65	-180	-80	-60
Stiffening Point (°F) (avg)	-25	-35	-15	-40	-10	-10	-150	-35	-20
Compression Set	Fair	Fair	Good	Good	Fair	Good	Very Good	Good	Very Good
Temp Resistance:
To 212°F	Very Good	Very Good	Very Good	Fair	Good	Good	Very Good	Good	Good
To 350°F	Good	Good	Very Good	Poor	Poor	Poor	Very Good	Poor	Poor
To 450°F	Poor	Poor	Very Good	Poor	Poor	Poor	Very Good	Poor	Poor
Gas Impermeability	Very Good	Good	Very Good	Good	Good	Good	Fair	Fair	Good
Abrasion Resistance	Very Good	Good	Fair	Very Good	Good	Good	Fair	Very Good	Very Good
Flex Resistance	Good	Good	Good	Very Good	Good	Good	Very Good	Good	Good

This information gives typical properties and is not to be taken as a warranty or any representation for which we assume legal responsibility, nor as permission or recommendation. It is offered soley for your consideration,investigation, and verification.

Viton® and Kalrez® are registered trademarks of DuPont Performance Elastomers.

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O-ring and elastomer properties

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