Abstract
When vulcanized natural rubber is heat-treated in the autoclave under a steam pressure of 10kg/cm2, naturally its tensile strength will decline depending on the duration of vulcanization before such treatment. However, there will be no difference in tensile strength corresponding to that in vulcanized degree.
This fact shows that a low-vulcanized rubber passes the optimum vulcanization point to shift into what seems a relatively level region and there the rubber seems to deteriorate under the heat of treatment.
