most widely used O-Ring elastomer. Excellent resistance to
petroleum products. Excellent compression, set, tear and
abrasion resistance. Does not have good resistance to ozone,
sunlight, or weather (unless specifically compounded). Should
not be stored in direct sunlight or near motors or other
electrical equipment which may generate ozone.
Temperature range: - 40° to +250°F.
Fluoroelastomer [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. APG stocks the Type
"A" Grade Fluoroelastomer. Other grades are available ─ please
Moderately resistant to petroleum products. Good ozone and
weather resistance. Good compression set. Excellent for
sealing refrigeration fluids such as Freon®.
Temperature range: -65° to +250°F.
Recommended for applications requiring a wide temperature range
and good dry heat resistance. Good weather and ozone
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 range: -80° to +450°F.
Highly Saturated Nitrile (HSN, HNBR)
Better resistance to high temperatures, superior physical
properties, and improved chemical resistance over traditional
nitrile compounds. It also has better resistance to ozone,
sunlight, and other atmospheric conditions. Excellent
resistance to compression set. Green HSN is used in refrigerant
R134a applications. Temperature range: -40° to +325°F.
Ethylene Propylene (EPR, EPDM, EPM)
Excellent resistance to Skydrol® fluids used in
commercial aircraft hydraulic systems. Also recommended for hot
water, steam, and phosphate ester type hydraulic fluids.
Resistant to some acids, alkalies, and ozone. Not recommended
for petroleum fluids or diester lubricants. Temperature range:
-65° to +300°F.
PTFE [TFE, Teflon® (E.I. duPont)]
White thermoplastic fluoroethylene resin offers a combination of
qualities not found in any other material ─ chemical inertness,
heat resistance, low friction, dialectric strength,
weatherability, zero water absorption, toughness, and
flexibility. Temperature range: -65° to +500°F.
Aflas® (Asahi Glass Co., Ltd.)
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, alcohols, and
a variety of other chemicals. Temperature range: -25° to
+450°F. (+500°F short term).
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 recommenced for
acids, ketones, and chlorinatied hydrocarbons. Some urethanes
are also sensitive to water and humidity. Temperature range:
-65° to +200°F.
Seamless and uniform Teflon® FEP encapsulation which
completely encloses a core material of either silicone or Viton®
elastomer. Matches the chemical and temperature resistance of
solid PTFE O-Rings and possesses the elasticity and recovery
properties of the core elastomer which are crucial in many
Good low/high temperature resistance. Excellent resistance to
petroleum oils and fuels. Used in aerospace applications for
fuel systems and systems requiring resistance to diester base
lubricants to +325°F. Due to limited strength and abrasion
resistance, this material is generally recommended for static
applications only. Temperature range: -80° to +350°F (+400°F
─ 80 Durometer
Chloroprene ─ 70 Durometer
Ethylene Propylene ─ 70 Durometer
Ethylene Propylene ─ 70 Durometer, NSF, Peroxide
Ethylene Propylene ─ 80 Durometer, Peroxide Cured
Fluoroelastomer ─ Black, 75 Durometer
Fluoroelastomer ─ Black, 90 Durometer
Fluoroelastomer ─ Brown, 75 Durometer
Fluoroelastomer ─ Brown, 90 Durometer
Fluorosilicone ─ 70 Durometer
Highly Saturated Nitrile ─ Green, 70 Durometer
Highly Saturated Nitrile ─ Black, 90 Durometer
Highly Saturated Nitrile ─ Blue, TFE Coated, 70
Nitrile ─ Black, 50 Durometer
Nitrile ─ Black, 70 Durometer
Nitrile ─ Black, Large Cross Section, 70
Nitrile ─ Black, 90 Durometer
Nitrile ─ Black, 90 Durometer, Peroxide Cured
Nitrile ─ White, 70 Durometer
Silicone ─ 70 Durometer
Encapsulated ─ Viton®
Encapsulated ─ Silicone Core
Urethane ─ 70 Durometer