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Oil Seal Compounds

There are many materials of oil seals. All of which vary in resilience to specific conditions. The most commonly used materials in oil seals are Buna (Nitrile) and Viton®.

Buna (Nitrile) oil seals are the most widely used elastomer in sealing. Nitrile oil seals have great resistance to petroleum oils and fuels, mineral oils and greases, hydraulic fluids, water, steam, and alcohol. Nitrile has a great set of attributes such as low compression set, high tensile strength, and abrasion resistance.

Viton® oil seals have a high temperature and chemical resistance to petroleum oils and fuels, mineral oils and greases, solvents, hydraulic fluids, water, and steam. They have low compression set characteristics. Viton® oil seals are used preferably in chemical exposure situations and for hard vacuum service.

Silicone oil seals have a high lubricant absorbency which minimizes friction and wear. Silicone oil seals are resistant to mineral and vegetable oils, salty solutions, and various environmental conditions. Silicone is typically used in the food and beverage and medical/pharmaceutical industries.

EPDM oil seals are suitable for use with alcohol, water, greases, and other environmental conditions. EPDM oil seals are resistant to organic and inorganic acids, sodium and potassium alkalis water, steam, and cleaning agents.

HNBR oil seals have excellent resistance to petroleum oils and sour gas. Compared to standard nitrile, HNBR oil seals have a better temperature range and higher abrasion resistance when exposed to chemicals.

Teflon® oil seals are tough, chemically inert, and have outstanding chemical resistance. Teflon® oil seals can be used in petroleum oils and fuels, solvents, and environmental conditions. Teflon® oil seals are for static and slow intermittent dynamic situations.

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Polyacrylate oil seals have higher heat resistance than nitrile. Polyacrylate oil seals resist petroleum oils and fuels, transmission fluid, and perform well in environmental conditions. Polyacrylate oil seals are preferred in high surface speed applications.

Oil Seal Compound Chemical Compatibility

The elastomer&#;s resistance to temperature, abrasion, chemicals, weather, sunlight, and ozone can affect a profile&#;s longevity and performance. The two most prevalent materials are Nitrile and Viton. Listed below with their respective chemical compatibilities are Nitrile, Viton®, Silicone, and Polyacrylate oil seal materials.

&#;Fluid Media Nitrile Viton Silicone Polyacrylate

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Tip: Materials Chart for Oil Seals

Some of the most common materials used for oil seals are nitrile, highly saturated nitrile, Viton®, FEP, silicone and polyacrylate.

 Materials & Temperature

 Applications

 Use With These Fluids

Simriz®
-10 C to +305 C Compound Specific
Simriz® oil seals are molded of an elastomer that has the broadest chemical resistance of any elastomeric material. They combine all the resilience and sealing force of an elastomer with a chemical resistance approaching that of FEP. most chemicals Aflas®
-10 C to +204 C Compound Specific
Aflas® oil seals are made from a unique fluoroelastomer that is resistant to petroleum oils, steam, hydrogen sulfide and amine corrosion inhibitors. petroleum oils, H2S, steam Carboxilated Nitrile
-54°C to 135°C Nitrile oil seals are made from a compound that tolerates low temperatures and has excellent abrasion resistance. petroleum oils, water FKM Fluorocarbon
-40 C to +204 C Compound Specific FKM Fluorocarbon oil seals feature excellent resistance to petroleum products and solvents. They have good high temperature and low compression set characteristics. They are suited for use with wide chemical exposure situations and for hard vacuum service. petroleum oils, gasoline, transmission fluid Fluorosilicone
-56°C to 204°C A fluorosilicone oil seal combines the good high and low temperature stability of silicone with the fuel, oil, and solvent resistance of fluorocarbon. This oil seal is resistant to petroleum oils and gasoline. petroleum oils, gasoline Highly Saturated Nitrile (HSN, HNBR)
-26°C to 160°C Oil seals made from highly saturated nitrile have excellent resistance to petroleum oils and sour gas. Because of the extended temperature range of highly saturated nitrile, it is becoming a preferred compound in the oil patch. petroleum oils, H2S, CO2 Nitrile (Buna-N)
-40°C to 135°C
Nitrile (Low-Temp)
-65°C to 120°C Nitrile is presently the seal industry's most widely used elastomer. Nitrile oil seals combine excellent resistance to petroleum based oils and fuels, silicone greases, hydraulic fluids, water and alcohols. Nitrile has a good balance of working properties such as low compression set, high tensile strength, high abrasion resistance, combined with a low cost. petroleum oils,
water, hydraulic oils Polyurethane
-40°C to 105°C Polyurethane is an excellent material with high abrasion resistance characteristics and high tensile strength. Polyurethane oil seals are used in high pressure hydraulic systems where highly stressed parts are subject to wear. These seals are resistant to petroleum oils and hydraulic oils. petroleum oils,
hydraulic oils FEP
-20°C to 204°C FEP is a tough, chemically inert polymer possessing an incredible working range. Oil seals from this material are for static and slow intermittent dynamic situations. FEP is hampered by a poor memory at low temperature. most chemicals Polyacrylate
-20°C to 170°C Polyacrylate has better heat resistance than Nitrile. It works well in high surface speed oil seals. petroleum oils, Freon Silicone
-60°C to 200°C Silicone oil seals have a high lubricant absorbency which minimizes friction and wear. petroleum oils, some acids

Data is presented for use only as a general guide and should not be the basis for design decisions. If you are designing oil seals and need help choosing the right material, just give us a call.

Next tip: Oil Seal Basics.

 

 

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