Abstract
Abstract In view of these results, it may be concluded that in this tread stock the minimum amount of pine tar or mineral rubber commensurate with good factory processing is desirable if the maximum abrasion resistance for a given cost is to be obtained. This means that softeners which are effective, as such, in smaller amounts than those available at present should find a use in tread compounding. Stearic acid should be held to a ratio of approximately 4 parts per 100 of rubber. Most of the laboratory tests give indications in the same direction as the road wear, but none coincide exactly.
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