Abstract
Abstract The relative merits of antiozonants, efficient vulcanization systems, and semi-efficient vulcanization systems for natural rubber in dynamic applications have been previously evaluated in a number of laboratory studies. This report covers an evaluation of the effects of these three factors on the laboratory fatigue testing of automotive suspension bushings. The use of semi-efficient vulcanization systems along with a good soluble antioxidant will provide the optimum resistance to the combined effects of oxidation and mechanical fatigue experienced in this application. Efficient vulcanization systems produce products with very poor service life. The use of substituted p-phenylenediamine (ppd) antiozonants can be an advantage or disadvantage in compression fit bushings, depending upon the type of service. Excessive amounts of ppd at the rubber-to-metal interface can cause slippage and early failure; therefore, the use of ppd's must be approached with caution in this application.
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