Comparison of Tire Cord and Elastomeric Materials

A Comparison of Tire Cord and Elastomeric Materials

Used in Spherical and Other Style Expansion Joints

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

1. Strength of Typical DuPont Industrial Yarns at Elevated Temperatures

2. Initial Modulus of Typical DuPont Industrial Yarns at Elevated Temperatures

3. Breaking Strength Retained by Unscoured Yarns After Exposure to Hot, Dry Air

Breaking Strengths at 70°F (21°C), 65% R.H. before and after exposure.

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)

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