A Comparison Of Tire Cord and Elastomeric Materials Used in Spherical and Other Style Expansion Joints

NOTE: At 250°F, there is no significant change in Kevlar Breaking Strength, Table 1; Modulus, Table 2; or Aging Properties, Table 3c.

ElastomersNatural RubberEPDMNeoprene®Hypalon®ChloroButylNitrile
Tensile Strength Carbon Black ReinforcementOver 3000 psi (2122 kg/cm2)Over 3000 psi (2122 kg/cm2)Over 3000 psi (2122 kg/cm2)Over 3000 psi (2122 kg/cm2)Over 2500 psi (1768 kg/cm2)Over 2000 psi (1415 kg/cm2)
Adhesion to MetalsExcellentGood to ExcellentExcellentExcellentGoodExcellent
Adhesion to FabricExcellentGoodExcellentGoodGoodGood
Tear ResistanceGoodGoodGoodFairGoodGood
Abrasion ResistanceExcellentExcellentExcellentExcellentFairGood
Permeability to GasesFairFairLowLow to Very LowGoodFair
Acid Resistance: DiluteFair To GoodExcellentExcellentExcellentGoodGood
Acid Resistance: ConcentratedFair To GoodExcellentGoodVery GoodFairFair
Resistance to: Swelling in Lubricating OilPoorPoorGoodVery GoodPoorExcellent
Resistance to: GasolinePoorPoorGoodGoodPoorExcellent
Resistance to: Animal and Vegetable OilsFairGoodGoodGoodGoodExcellent
Resistance to: Water AbsorptionVery GoodVery GoodGoodVery GoodVery GoodGood
Resistance to: OxidationGoodExcellentExcellentExcellentExcellentGood
Resistance to: OzoneFairOutstandingExcellentOutstandingExcellentFair
Resistance to: Sunlight AgingPoorOutstandingVery GoodOutstandingExcellentPoor
Resistance to: Heat AgingFairExcellentGoodExcellentExcellentGood
Temp. Ratings Continuous Service: *Hot180°F (82°C)250°F (121°C)200°F (93°C)250°F (121°C)250°F (121°C)220°F (104°C)
Temp. Ratings Continuous Service: *Coldminus 10°F (minus 23°C)minus 60°F (minus 51°C)minus 10°F (minus 23°C)minus 10°F (minus 23°C)minus 10°F (minus 23°C)10°F (minus 12°C)