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.
Scope:
ASTM E303 – 93 test method measures the surface frictional properties using the British Pendulum Skid Resistance Tester. The British Pendulum Tester is a dynamic pendulum impact-type tester used to measure the energy loss when a rubber slider edge is propelling over a test surface.
Test Procedure:
This test method was performed by using a pendulum-type tester with a standard rubber slider to determine the frictional properties of a test surface. The test surface is cleaned and thoroughly wetted before testing. The pendulum slider is positioned to barely contact the test surface before conducting the test. The pendulum is raised to a locked position and then released, thus allowing the slider to contact the test surface. A drag pointer indicates the British Pendulum (Tester) Number.
FIGURE 1. British Pendulum Tester
Specimen size:
A material with flat surfaces of 76 to 78 mm
Data:
Determine the testing error as follows:
E= tσn-1/2
Where:
E = testing error,
t = normal curve of 1.96 or 2.0 rounded,
σ = standard deviation of individual test results (BPN units), and
n = number of tests.
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