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Experiments were carried out to determine the resistance of rubber products to vibration. There were no essential changes in mechanical properties as a result of vibration for 50 to 100 hours. There were on the other hand considerable changes in electrical properties, e. g., the insulation resistance decreased with increase in time of vibration. Further experiments in connection with this problem will be carried out to obtain data on the effects of vibration for prolonged periods. The authors wish to thank Messrs. Endo, Taguma, Hamono, and Wada for their aid in the experimentation.

Tests of rubber mixtures compounded with nine different accelerators indicated that those with relatively great hardness have relatively little absorption and those with less hardness have more. Rubber products which are not required to be particularly soft can be made with fairly good oil-resistant properties by the proper selection of accelerators and by vulcanizing to the optimum point.