The result of microstructure examination
revealed that worm surfaces were characterized by abrasion wear where the asperities were
ploughed thereby exposing the white region of palm kernel fibers, thus increasing the smoothness
of the friction materials. Sample S6 with composition of 40% epoxy-resin, 10% palm wastes, 6%
Al2O3, 29% graphite, and 15% calcium carbonate gave better properties.