Abstract
Abstract Results of the Akron-Croydon abrasion test on rubbers of the tire-tread type are not appreciably influenced by the direction of the grain. Consequently, it is considered satisfactory to test such rubbers by using the normal (edge) type of specimen, prepared by vulcanizing, in a suitable mold, a disc cut from a sheet of the unvulcanized stock about 13 mm. thick.
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