of the blends tend to be independent of curing system when
RR content is high. EV vulcanizates exhibit greater heat
aging resistance than CV vulcanizates, particularly when
RR content is less than 50 phr, due to the greater thermal
stability of mono- and di-sulfidic crosslinks compared to the
polysulfidic ones. Although most of the properties of the
blends are adversely affected by the addition of reclaimed
rubber, the value of each property, especially when the ratio
of NR/RR equals 80/20, may be suitable for some
applications. Owing to the currently high price of the virgin
rubbers and increasing environmental concerns, the utilization of reclaimed rubber as a cost-beneficial extender
should be a good alternative for many rubber applications