ASTM E303 – 93 Test Method for Measuring Surface Frictional Properties Using the British Pendulum Tester
ASTM E303 – 93 Test Method provides a measure to determine the relative effects of various polishing processes on materials or material combinations. The values measured, BPN = British Pendulum (Tester) Number for flat surfaces and polish values measurements on curved laboratory specimens from accelerated polishing-wheel tests.
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