TEFLON
- Most commonly used seat material for food application. Has extensive chemical and temperature resistance.
- Not suitable for great temperature fluctuations: Teflon tends to coldflow and does not return to its original shape.
- Can be used as a coating on other elastomers.
- Useful temperature range: 0°F to 250°F
BUNA N
- Nitrile compound provides an elastic seat that makes for leak-free, easy handling of valve. Least expensive elastomer.
- Good chemical resistance: excellent for use with petroleum solvents, gasoline, alcohol, etc.
- Recommended lubricant: silicone
- Useful temperature range: 0°F to 180°F
EPDM
- Good for higher temperatures (low pressure steam to 30 psi)
- Good resistance to mild acids, dilute alkalis, silicone oils and greases, ketones and alcohol.
- Avoid use for petroleum oils or di-ester based lubricants
- Useful temperature range: 40°F to 250°F
VITON®
- Both extreme temperature and good chemical resistance.
- Useful at high temperature when buna or EPDM is not suitable.
- Recommended lubricant: silicone
- Useful temperature range: 0°F to 350°F
Viton is a registered trademark of DuPont Dow Elastomers.
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