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The destructive action of ozone on vulcanized rubber has been known for a long time. As far back as November, 1868, Samuel F. B. Morse complimented Austin Goodyear Day for his “Kerite” insulation because it had been found to resist the deteriorating effects of the ozone of the atmosphere (1) However, it was not until the publication of the work of Williams in 1926 (2) and that of Van Rossem and Talen in 1931 (3) that the role of ozone in the weathering of vulcanized rubber was clarified. These workers found that the multiple cracking which occurs on stretched rubber on outdoor exposure is caused by the ozone in the atmosphere and not by the effects of light. R. G. Newton (4) confirmed this conclusion in 1945. In 1946, Crabtree and Kemp (5) also confirmed the conclusion and later described an accelerated ozone weathering test for rubber (6). This method has been published as ASTM Method D 1149 and fundamentally involves exposure of specimens under stress to a controlled concentration of ozone in air at a definite temperature. This review is solely concerned with comparisons of ozone resistance found by such tests with that found by exposure outdoors. It is proposed to discuss accelerated and natural tests, compare results obtained in the two types of tests and then attempt to draw some conclusions.
Vacca, G. N.
Bell Telephone Laboratories, Inc., Murray Hill, N. J.