“…The average range of CoF was found to be between 0.121–0.178, which suggests the presence of a boundary lubrication mechanism. 8,38 In contrast, the CoF of pure BHD was found to be 0.452. The film percentage, which indicates the formation of a protective layer on the metal surface to prevent wear, was observed to be between 96–98% for the range of FAME concentrations studied.…”