Elastomer materials guide

We supply O-rings and custom molded shapes in dozens of elastomer compounds. Below are the most common families and where each fits. Ranges are general guidance; the compound data sheet and your specification govern.

Bar chart of typical service temperature ranges: nitrile, neoprene and EPDM about minus 65 to 300 F; fluorocarbon minus 20 to 400 F with brief exposure to 600 F; fluorosilicone minus 80 to 350 F; special silicone compounds minus 175 to 400 F with heat-resistant grades to 600 F — Typical service temperature ranges by elastomer family.

Nitrile (NBR, Buna-N)

The most versatile elastomer, with excellent resistance to most petroleum oils and fuels. Typically compounded for about -65°F to +300°F. Good compression set, tear and abrasion resistance; poor resistance to ozone, sunlight and weathering.

Fluorocarbon (FKM, e.g. Viton®)

Combines compression-set resistance, high-temperature capability and broad chemical resistance. Typically about -20°F to +400°F, with brief intermittent exposure to +600°F. A common upgrade from nitrile where heat or chemicals are a problem.

Ethylene propylene (EPDM, EPR)

Excellent resistance to water, steam, alcohols, engine coolants, sunlight and weathering, and to phosphate-ester hydraulic fluids such as Skydrol®. Typically about -65°F to +300°F. Not recommended for petroleum oils or fuels.

Silicone (VMQ)

Excellent at temperature extremes: special compounds reach -175°F flexibility or +600°F heat resistance. Usually used in static seals because of lower tear and abrasion resistance; common in medical products, electrical apparatus and dry-air service up to about 400°F.

Fluorosilicone (FVMQ)

Silicone's high and low temperature performance with much better fluid resistance. Common in aircraft fuel systems. Typically about -80°F to +350°F.

Neoprene (CR, chloroprene)

Resists weathering and petroleum lubricants, with good flex and tear resistance. Typically about -65°F to +300°F. Common in refrigerant seals.

Matrix rating NBR, FKM, EPDM, VMQ, FVMQ and CR as good, depends or avoid for petroleum oils, water and steam, ozone, phosphate-ester hydraulic fluid and abrasion — Simplified selection guide. Always confirm against compound data and testing.

Viton® is a registered trademark of The Chemours Company. Skydrol® is a registered trademark of Eastman Chemical Company.

Many other compounds are available. Tell us the fluid, temperature, pressure and any specification callouts and we will recommend a compound.