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A technique has been developed for evaluating the activity of antioxidants in rubber samples using a differential thermal analyzer. Results were obtained at 300 p.s.i. and atmospheric pressure, the former being apparently more significant than the latter. Evaluations were carried out on eight rubber samples which contained either an antioxidant of the phosphite, amine, or phenol type or no antioxidant. The activation energies and reaction orders were also estimated for the oxidation under 300 p.s.i. oxygen. Techniques used in this work evaluate only the free radical trapping ability of the antioxidant and are not effective for peroxide scavenging-type antioxidants. Oxidation of rubber at high temperatures proceeds by several paths simultaneously.

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