ASTM D1871 cover testing the strength of adhesion of single-filament wire to vulcanized rubber compounds. ASTM D1871 applies to wire made from brass, bronze, or zinc coated steel wire. Adhesion strength is expressed as the magnitude of the pull-out force for the single filament of wire. To contribute to the mechanical properties required in a product, tire bead wire must have good adhesion to the rubber matrix. This allows the rubber to absorb part of the energy, distributing it uniformly between the reinforcing material and the rubber compound.

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