ASTM D2534 Standard Test Method for Coefficient of Kinetic Friction for Wax Coatings
12. Report
12.1 Report the average of three separate tests as the coefficient of kinetic friction (µk) to two significant figures.
13. Precision and Bias
13.1 The precision of this test method as determined by statistical examination of interlaboratory results is as follows:
13.1.1 Repeatability - The difference between two test results, obtained by the same operator with the same apparatus under constant operating conditions on identical test material, would in the long run, in the normal and correct operation of the test method, exceed the following values only in one case in twenty:
0.06(µk in range from 0 to 1)
13.1.2 Reproducibility - The difference between two single and independent results obtained by different operators working in different laboratories on identical test material would, in the long run, in the normal and correct operation of the test method, exceed the following values only in one case in twenty:
0.17(µk in range from 0 to 1)
13.2 The above precision data were obtained in a round-robin involving nine laboratories on four samples.
13.3 Bias - The procedure in this test method has no bias because the value of coefficient of kinetic friction can be defined only in terms of a test method.
14. Keywords
14.1 coefficient of kinetic friction; kinetic friction; wax; wax coatings
