ABSTRACT
Tribometers sold and used in the United States include the build-it-yourself horizontal dynamometer pull meter method, the 1960s-era horizontal pull slipmeter (HPS), the laboratory-only James Machine, and the proprietary portable inclinable articulated strut tester (PIAST) and Variable Incidence Tribometer (VIT) devices. Some methods are only approved for speciœc uses. With few exceptions (polishes and bathtubs), U.S. slipmeter standards specify no threshold of safety. They are test methods, or steps to follow to arrive at presumably valid results using the speciœed test device.
