A technique was developed for vulcanizing cylinders of rubber 0.5 inch in diameter and up to 1 inch long at pressures as high as 150,000 pounds per square inch using a small laboratory press (8-inch square platens). The specially designed mold was made of alloy steel according to general principles from the high pressure work of Bridgman
An apparatus for measuring stress relaxation in rub-"ber under compression is described. Expansion of a Sylphon bellows by air pressure compresses small cylindrical test pieces. As stress in the samples decreases
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