Accelerated sulfur vulcanization of Standard Malaysian Rubber in the p
resence of o-bis(2,3-epoxypropyl-4-cyano-4-methyl-butylether) gives lo
w epoxidized vulcanizates having improved oil and thermo-oxidative age
ing resistances. Practically no changes in their room-temperature resi
lience have been found. The best results have been obtained in the cas
es of vulcanizates corresponding to 1 and 2 mole% epoxidation.