ASTM D4055 Standard Test Method for Pentane Insolubles by Membrane Filtration
10. Report
10.1 Report the percentages of pentane insolubles by membrane filtration as:
pentane insolubles (0.8 µm) percent weight
10.2 Some new oil chemistry will require determination of a baseline value for the new oil (that is, the blank determination may not be zero).
11. Precision and Bias
11.1 The precision of this test method as determined 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:
0.177 x 2 / 3x = average of two results
11.1.2 Reproducibility - The interlaboratory precision (reproducibility) of this test is very poor, and this method of measuring pentane insolubles is unsuitable for the purpose of comparison of interlaboratory results. Additional cooperative studies to improve the precision are planned.
0.759 x 2 / 3x = average of two results
11.2 Bias - A statement of bias is not applicable since a standard reference material for this property is not available.
12. Keywords
12.1 lubricating oils; membrane filtration; pentane insolubles
