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1
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2
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3
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4
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5
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6
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7
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8
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9
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10
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Common Name
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NR Natural Rubber
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IR Synthetic Rubber
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SBR
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IIR Butyl
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EPR EP Rubber
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CR Neoprene
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NBR
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Polyurethane
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Silicone
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Fluro Elastromers
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Chemical Name
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Natural Polyisoprene
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Synthetic Polyisoprene
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Styrene Butadiene
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Isobutylene Isoprene
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Ethylene Propylene
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Chloroprene
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Nitrile Butadene
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Polyurethane Diisocyanate
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Polysiloxane
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Fluorinated Hydrocarbon
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ASTM-SAE Designation
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Type R - no contact with petroleum-base fluids
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Type R - no contact with petroleum-base fluids
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Type R - no contact with petroleum-base fluids
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Type R - no contact with petroleum-base fluids
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Type R - no contact with petroleum-base fluids
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Type SC - medium-oil resistance
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Type SB - Good oil resistance
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None yet assigned
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Type TA - Broad temperature range
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Type TB - Resistance to elevated temperature and solvents
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Relative Cost SBR = 100
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61
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100
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100
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125
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100
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125
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140
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500
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1000
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3000
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Advantages
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Mostly used for high mechanical performance unless some specific environmental condition prohibits.
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Resistant to abrasion, impact
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Outstanding gas impermeability Good damping at normal temp. Resists aging at high temp. Resistant to ozone, alcohol diester lubes
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Resistant to heat aging, oxidation, ozone, acids, alkalis, hydraulic fluids.Good electrical properties.
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Resistant to weather, ozone, gasoline, oil, elevated temperature, Flame resistant
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Good physicals Resistant to gasoline, oil, elevated temperatures.
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Highest available abrasion resistance, strength and load bearing.High elongation, hardness.Resistant to oxygen and ozone.
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Broadest available temperature range. Retain properties over temperature range. Resistant to aging, ozone, oil. Good flex resistance.
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Outstanding resistance to oxygen, ozone, most solvents. Retains properties for long exposure to high temperature. Flame resistant Low permeability
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Disadvantages
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Affected by heat, aging, sunlight, oxygen, ozone, gasoline and oil. Aromatic hydrocarbons, degreaser solvents, silicate hydraulic fluids.
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Affected by heat aging, ozone, hydrocarbon solvents, and oil. Only fair electrical properties. Good physical properties Requires reinforcement.
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Affected by gasoline, oil, degreaser solvents. Low resilience Medium physical properties
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Affected by aromatic and aliphatic solvents. Poor tear resistance.
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Affected by aromatic hydrocarbons, phosphate, and hydraulic fluids.
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Affected by degreaser solvents Good Physicals Requires reinforcement
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Affected by acid, alkalis, aromatics, and esters. Good performance only with high hardness.
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Low physical properties at room temperature. Affected by gasoline, degreaser and solvents (Note: Special fluorinated silicone resists fuels, solvents and oils)
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Poor dynamic properties at low temperatures
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Typical Trade Names
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Ameripol SN Natsyn Isoprene
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Philprene Ameripol SBR Plioflex Naugopol Poyser S S-Polymers Synpol Baytown Copo FR-S ASRC
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Enjay Butyl Polysar Butyl Bucar Petrotex Butyl
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Nordel Royalene Vistalon Epsyn
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Neoprene
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Hycar Chemgum Paracril Polysar Krynac FR-N
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Adiprene Chemigum SL Texin Vibrathane Elastothan Genthane Esthane
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Silastic G.E. Silicones U.C. Silicones Si-O-Flex
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Viton Fluorel Kel-F Elastomer
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