Basic O-ring Materials

	O-ring Materials

 Aflas:   (Asahi Glass Co., Ltd.)  Compound has advantageous combination of high temperature, chemical and electrical resistance properties. Recommended for oils and lubricants, hydraulic and brake fluids, transmission and power steering fluids, sour oil and gas (H2S), amine corrosion inhibitors, ozone, steam, acids, bases, alcohol, and a variety of other chemicals. Temperature: -20o to +400oF(+600oF short term).

 Buna N:  (Nitrile) The most widely used O-Ring elastomer with excellent resistance to petroleum products and excellent compression set, tear and abrasion resistance. Temperature: -40o to +250oF.

 Ethylene Propylene:   (EPM, EPDM) (EPR)  Excellent resistance to Skydrol fluids used in commercial aircraft hydraulic systems. Also, recommended for hot water, steam, and phosphate ester type hydraulic fluids. Also resistant to some acids, alkalies, and ozone. Not recommended for petroleum fluids or diester lubricants. Temperature: -65o to +300oF.

 Neoprene:   (Chloroprene)  Moderately resistant to petroleum products. Good ozone and weather  resistance. Good compression set. Excellent for sealing refrigeration fluids such as Freon.  Temperature: -65o to +250oF.

 Perfluoro:  Combines the outstanding chemical characteristics of PTFE with the elasticity of rubber.  This combination provides the most durable, reliable and cost efficient solutions for aggressive chemical and temperature environments.  Temperature: -20o to +450oF.

 Silicone:   Recommended for applications requiring a wide temperature range and good dry heat resistance. Limited oil resistance. Not normally recommended for dynamic sealing applications due to relatively poor tensile and tear strength and relatively low abrasion resistance. Temperature: -80o to +450oF.

 TFE:   (PTFE) Trade Name: Teflon (E.I. DuPont) White thermoplastic fluoroethylene resin offers a combination of chemical inertness, heat resistance, low friction, dielectric strength, weatherability, zero water absorption, toughness, and flexibility.  Temperature: -65o to +500oF.

 Urethane:   Resistant to petroleum oils, hydrocarbon fuels, oxygen, ozone, and weathering. Particularly  recommended for hydraulic systems where high pressures, shock loads, wide metal tolerances, or abrasive contamination is anticipated. Not recommended for acids, ketones, and chlorinated hydrocarbons. Some urethanes are also sensitive to water and humidity. Temperature range: -65o to +200oF.

Viton:  (Fluorocarbon) Trade Name: Viton (E.I. DuPont)  Excellent mechanical and physical properties. Good resistance to petroleum products, low compression set, and high temperature resistance. Wide spectrum of chemical compatibility. Good for vacuum service and low gas permeability. Temperature: -15o to +400oF (limited exposure)