Abstract
Abstract A review of the literature permits no definite conclusion concerning the influence of temperature of vulcanization on the ultimate quality of a rubber product. Some investigators claim equal properties at different curing temperatures, others superior properties at low temperatures, while still others believe superior qualities are obtainable at higher temperatures. Concerning the influence of temperature on aging, no conclusive data are available. The temperature of cure has no influence on the tensile properties at maximum, in the case of the di-o-tolylguanidine stock. In the case of the mercaptobenzothiazole stock, there is a trend toward slightly higher tensile strength as the temperature is decreased. Natural, as well as artificial, aging of the di-o-tolylguanidine slock shows that the lower the temperature of cure, the better the aging will be. The results are clean-cut, probably owing to the fact that this is a stock which ages rapidly and hence shows differences in comparatively short periods of aging. The data on the mercaptobenzothiazole stock containing an antioxidant are far from conclusive, though they show a trend toward belter aging with lower temperatures of curing.
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