Cut and chip resistance of NR-BR blend compounds

The laboratory cut and chip resistance of natural rubber/polybutadiene rubber (NR-BR) blends was determined using B.F. Goodrich cut and chip tester. The resistance to cut and chip of the BR was considerably higher than that of NR. The hardness, stress at 300% elongation, and stress at break were observed to decrease with increasing BR content. The frictional coefficient of carbon black-filled NR (FNR) was about two times higher than that of carbon black-filled BR (FBR), indicating that higher frictional energies were subjected to the FNR specimen. The rebound of the blend increased with increasing BR content.