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The purpose of this report is to show the effect of the temperature of exposure in an air aging test on the rate of deterioration of the properties of typical vulcanizates of natural rubber, GR-S, GR-I, nitril rubber and neoprene.
The results show that over the temperature range of 70 C. to 125 C. the rate of deterioration is dependent on temperature, and the temperature coefficient of aging varies between 1.80 and 3.05 per 10 C. depending on the composition of the material and the property being measured.
The nature of the deterioration in all materials tested is the same over this temperature range except for those materials which develop a nonhomogeneous cross-section during aging. Above 125 C. all the materials tested appeared to undergo a different kind of deterioration.
The test tube method of air aging was found to be approximately equal in severity to the oven method.
Schoch, M. G.
Superintendent, Quality Control, Hewitt Rubber Div., Hewitt-Robins Inc., Buffalo, N. Y.
Juve, A. E.
Director, Compounding Research, B. F. Goodrich Co., Brecksville, Ohio