MATERIALS
BUNA N (NITRILE):
Has excellent resistance to petroleum oils and gasolines. Resistance
to aliphatic hydrocarbons, acids and bases is good. The temperature
range is -40˚F to +212˚F, intermittent to +230˚F. Excellent
resistance to permanent compression. It does not possess good
resistance to ozone, sunlight or weather. Also available in an FDA
compound.
NEOPRENE (CHLOROPRENE):
Neoprene has good resistance to oils, sunlight and aging.
Temperature range is -40˚F to +230˚F, intermittent to +250˚F.
Resistance to compression set is good. Chemical resistance to
silicone oil and grease, refrigerants, ammonia and carbon dioxide.
Also available in an FDA compound.
SILICONE:
Silicone retains good elastomeric properties at both low and high
temperatures. Should not be exposed to fuels, solvents or silicone
fluids. Silicone has excellent resistance to ozone, aging and
weather. Serviceable temperature range from -67˚F to +400˚F,
intermittent to +450˚F. Also available in an FDA compound.
EPDM (EPR):
EPDM combines excellent resistance to deteriorative effects of
ozone, oxygen, weather, heat and many chemicals. Its serviceable
temperature range is -40˚F to +250˚F and intermittent to +275˚F. It
is not recommended for use in contact with petroleum oils or fluids.
Also available in an FDA compound.
FLUOROELASTOMER (VITON®):
Viton® has excellent resistance to high temperatures, ozone, oxygen,
fuels, mineral oil and synthetic hydraulic fluids. Maximum operating
temperatures run from 400˚F in continuous service up to 500˚F in
intermittent service. Also available in an FDA compound.
POLYURETHANE:
Polyurethane elastomers, as a class, have excellent wear resistance
and high tensile strength, along with excellent ozone and oxidation
resistance.
NATURAL RUBBER:
Crude natural rubber is found in the juices of many plants,
including the shrub guayule, Russian dandelion, goldenrod and dozens
of other shrubs, vines and trees. The principal source is the tree
Hevea Brasiliensis which is native to Brazil. Natural rubber has
high resilience, good tensile strength and good tear resistance. It
does not perform well when exposed to chemicals and petroleum
derivatives. Natural rubber is inferior to many of the synthetics in
heat aging, resistance to sunlight, oxygen, ozone, solvents and
oils. The temperature range is -55˚C to +55˚C (-67˚F to +122˚F).
SBR (BUNA S):
SBR is a copolymer of styrene and butadiene and has properties
similar to natural rubber. It has greater abrasion resistance than
natural rubber, better wear resistance and better low temperature
flexibility. Though superior in water resistance to natural rubber,
it has about the same resistance to solvents and chemicals. It has
better heat resistance and heat aging qualities than natural rubber,
and in excess heat it hardens and becomes brittle instead of
softening as does natural rubber. Resistance to sunlight and ozone
is similar to natural rubber. The temperature range of SBR is -55˚C
to +70˚C (-67˚F to +158˚F). SBR rubber is available in sheet
material, but we do not carry it in cord stock.
BUTYL:
Butyl rubber is a copolymer of isobutylene and isoprene. It has
exceptionally low gas and moisture permeability and outstanding
resistance to heat aging, weather, ozone, chemical attack, flexing,
abrasion and tearing. It has good resistance to phosphate ester
based hydraulic fluids, and has excellent electrical isolation
performance. Butyl is not recommended for use when in contact with
petroleum oils and fluids. The temperature range is -55˚C to +120˚C
(-67˚F to +248˚F). We carry only in sheet material.
TEFLON:
When parts are fabricated from TFE (polytetrafluroethylene) the
exceptional chemical, electrical, mechanical and thermal properties,
become apparent. TFE properties are as follows: extreme corrosion
resistance, excellent weathering, nonflammable, very low frictional
coefficient, no-adhesive, high heat resistance, and surface
resistivity, FDA compliant, USDA approved. The working temperature
range for Teflon is -200˚C to +260˚C (-328˚F to +500˚F).