show the tensile properties of carbon-black-
filled NR/EPDM and NR/R-EPDM blends. The results indicated
that the tensile strength of these two blends
decreased with increasing weight ratio of EPDM or REPDM.
The reduction in tensile strength of carbon-black-
filled NR/EPDM and NR/R-EPDM blends was due to
incompatibility between the natural rubber and the EPDM
or R-EPDM rubber