O-Ring and Elastomer Properties
Basic O-ring and elastomer property guidelines for common O-ring compounds, including high and low temperature gaskets and seals, water resistance, ozone resistance, gas impermeability 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 isn't intended as a warranty or representation for which Sealing Devices assumes legal responsibility, permission or recommendation. It is offered soley for your consideration,investigation, and verification.
Viton® and Kalrez® are registered trademarks of DuPont Performance Elastomers.
