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Material |
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General Properties |
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Common Applications |
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Buna-N
(Nitrile/NBR)
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Good resistance
to petroleum and fuels.
Widely used with most oils, hydraulic
fluids, alcohol.
Many compound variations for specific
applications.
Basic temperature range: -40 F to +250 F* |
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Petroleum oil
seals
Hydraulic fluid seals
Water / Greases
Transmission fluid seals |
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Viton®
(Fluorocarbon)
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Excellent high temperature and chemical
resistance.
Excellent mechanical and physical
properties.
Low compression set set and low gas
permeability.
Basic temperature range: -20 F to +400 F* |
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Vacuum seals
Acids / Fuels
High heat
Chemicals / Solvents |
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Trade Names:
Fluorel (3M) • Viton® (DuPont Dow Elastomers)
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Silicone
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Broad
temperature range. Odorless / non-toxic.
Resistance to sun and ozone.
Poor tear and abrasion strength. Poor
resistance to oils.
Basic temperature range: -80 F to +400 F* |
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Dry heat
Alcohol / Oxygen
Electrical / Medical
Low temperature |
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Trade Names:
Silastic (Dow)
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EPDM/EPR
(Ethylene Propylene)
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Resistance to sunlight, weathering and ozone.
Poor resistance to petroleum oils and
fuel.
Good heat and compression set resistance.
Basic temperature range: -65 F to +250 F* |
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Steam / Hot water
Hydraulic / Skydrol
Auto brake systems
Alcohol / Greases |
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Neoprene®
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Good resistance
to petroleum oils.
Low compression set and good tear and abrasion
strength.
Good resistance to weathering, sunlight and
ozone.
Basic temperature range: -40 F to +225 F* |
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Refrigeration
seals
Freon / Air conditioning
Motor mounts
Engine coolants |
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Kalrez® |
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High temperature
and chemical resistance.
Low compression set.
Various compounds for specific applications.
Basic temperature range: compounds up to +600 F* |
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Chemicals
+600 F
Steam +550 F Water |
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Trade Names:
Kalrez® (E.I. DuPont) |
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PTFE
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Excellent temperature range.
Various chemical and fuel resistance.
Low coefficient of friction. Non-elastic.
Basic temperature range: -250 F to +450 F* |
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High / Low temperatures
Chemicals / Fuels
PTFE Encapsulation
PTFE coating |
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Trade Names:
PTFE ( DuPont Dow Elastomers)
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Aflas®
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Excellent
resistance to petroleum products,
steam, phosphate esters and brake fluids. Broad
range media resistance similar to EPDM
and Viton®. Elastomeric form makes it low in gas
permeability
Basic temperature range: -20 F to +400 F* |
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O-rings for
various fluids seals.
Petroleum fluids and steam, amines,
brake fluids or phosphate esters. |
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Trade Names:
Aflas® (3M)
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Polyurethane
(Urethane) |
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Highly resistant to oil swell, ozone, oxidation
and abrasion.
Highly resilient and having a high tensile
strength and
elongation properties. An excellent choice for
hydraulic
seals using petroleum based oils.
Basic temperature range: -65 F to +200 F* |
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Hydraulic seals in oil, such as u-cups,
o-rings, wipers.
*Some Polyurethanes are now available
for water and water based fluids at
temperatures to 220 F*.
Petroleum based oils. |
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Highly Saturated
Nitrile
(HSN/HNBR) |
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Excellent
abrasion resistance, compression set, tensile
and tear properties. A step above standard
Nitriles in that it exhibits resistance to
ozone, sunlight and other atmospheric
conditions. Vastly improved resistants to heat
aging.
Basic temprature range: -40 F to +300 F*
(Short periods up to +300 F*) |
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O-rings for
various petroleum fluids.
Available in other forms for hydraulic seals
such as u-cups, vee packings, wipers and
back-up rings and special sealing rings.
Petrloeum fluids. Water. Silicone fluids.
Ehylene glycol. |
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Trade Names:
Therban (Mobay) • Zetpol (Zeon Chemical) •
Tornac (Polysar) |
