Abstract
Abstract A fairly rapid quantitative technique for measuring the cracking damage done to rubber by ozone has been described. The method consists of microscopic measurement of the length and width of selected ozone cracks. The product of the “average” length and width is termed the “severity of ozone cracking” and is abbreviated, SOC. The SOC value for a specimen is approximately 2 times the void area in arbitrary units. The use of the SOC technique in conjunction with an outdoor dynamic ozone test showed how various antiozonants perform in NR, SBR, and OE-SBR both with and without wax. Some effects of the amount and type of extending oil and of wax melting point are illustrated. Weather plays an important role in regard to ozone attack especially for wax containing compounds. During the warmer months higher melting waxes perform better in natural and OE-SBR while higher melting waxes perform slightly poorer in non-oil extended SBR. Good correlation was found between the outdoor flexing tests and service type outdoor tire tests carried out on an outdoor wheel. Some of the ramifications of this type of testing are pointed out.
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