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Trade Names:
The 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.
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Elastomer Descriptions and Properties
Nitrile (Buna-N)
Fluoroelastomer
Trade Names:
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 range: -15° to +400°F (limited exposures to higher temperatures).
Chloroprene
Trade Names:
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.
(Neoprene)
Trade Names:
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.
Silicone
Chemigum (Goodyear) Ny Syn (Copolymer) Krynac (Polysar)
Hycar (Zeon Chemical) Paracril (Uniroyal) Perbunan (Mobay)
Viton (E.I. duPont) Fluorel (3M)
Neoprene (E.I. duPont) Butachlor (Ditsugil) Bayprene (Mobay)
Silastic (Dow)
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°F to
+325°F.