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The problem of ozone attack on unsaturated rubbers has been recognized for some time but quantitative studies of this problem have only recently appeared in the literature. This is in great part due to the intractable nature of the phenomenon in regard to measuring the extent of cracking. In recent years several workers have been active in this field. Shaw and Adams (1) employed both electrical resistivity and creep under intermittent load to measure the attack of ozone. Rugg (2) used a microscopic technique to measure crack depth. Gable and Leeper (3) reported on the effect of a series of antiozonants on continuous creep in ozone. Buckley and Robinson (4) described a technique for determining the short-range creep of butyl rubber in ozone with a strain gage apparatus. Earlier Newton (5) and Crabtree and Kemp (6) contributed to an understanding of the action of ozone on rubbers. The work to be described in this report covers two main points (a) securing a controlled ozone atmosphere in which to carry out tests and (b) a description of some of the preliminary results of a program intended to provide basic information on the phenomenon of ozone cracking.
Veith, A. G.
Research Chemist, B. F. Goodrich Research Center, Brecksville, Ohio