Table 1. Material Composition of Polyisoprene Rubber.

components	weight composition (wt %)
natural rubber	62.6
carbon black	31.3
stearic acid	1.3
zinc oxide	1.5
N-(1,3-dimethylbutyl)-N′-phenyl-p-phenylenediamine	1.3
N-cyclohexyl-2-benzothiazolylsufenamide	0.4
sulfur	1.1
polymerized trimethyl dihydroquinoline	0.6
total	100.0