ASTM D721 Standard Test Method for Oil Content of Petroleum Waxes
10. Report
10.1 Report the result as oil content, Test Method D721. If the result is negative, report as zero.
11. Precision and Bias
11.1 Precision - The precision of this test method as determine by statistical examination of interlaboratory results is as follows:
11.1.1 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 + 8% of the mean
11.1.2 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:
0.2 + 11% of the mean
11.2 Bias - The procedure in this test method has no bias because the value of oil content can be defined only in terms of a test method.
12. Keywords
12.1 oil content; petroleum wax; wax
