OmniPAC Inc
Sealing Specialists Since 1969
For immediate assistance: 866-762-0400
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OmniPAC Inc
720 N 17th St  Ste 4
Saint Charles, IL 60174-1529
Ph: 866-762-0400
Fx: 630-762-8211


Nitrile (Buna-N)

The most common material. Nitrile has excellent resistance to most petroleum products and fuels and can be made to work over a temperature range of -65°F to + 300°F. Nitriles have excellent resistance to compression, tear and abrasion. They do not possess good resistance to ozone, sunlight or weathering.


Designers are switching from Nitrile to Fluorocarbons due to the superior combination of compression set resistance, high temperature properties and broad chemical resistance. These compounds can be used from -20° to + 400°F with brief intermittent exposure to +600°F.


Silicones possess excellent temperature capabilities. Silicone compounds are available that can retain flexibility at -175°F or are heat resistant to +600°F. Silicone does not have good tear and abrasion resistance so it is mostly used in static seals.


Fluorosilicones have much better resistance to a variety of fluids while retaining the high and low temperature properties of silicone. These materials generally have a temperature range -80°F to +350°F.

Ethylene Propylene (EPR, EPDM)

This material has superior resistance to water, steam, alcohols, engine coolants, sunlight and weathering. Excellent general purpose temperature range of -65°F to +300°F. FDA food grade and NSF 61 approved compounds are available. It has excellent resistance to Skydrol and other types of hydraulic fluids. Not recommended for use with petroleum oils or fuels.


Neoprene also has good resistance to flexing. It has the combination of resistance to weathering and petroleum lubricants over a temperature range from -65°F to +300°F. Commonly used for refrigerant seals.


Ths material is resistant to a wide range of different chemicals including acetone, lacquers, and toluene. Perfluoroelastomers have a service temperature range of -15°F to +400°/+450°F.