ASTM D2782 Test Method for Measurement of Extreme-Pressure Properties of Lubricating Fluids (Timken Method)
11. Report
11.1 Report the OK and score values in terms of the mass (weights) placed on the weight pan hanging from the end of the load-lever arm; do not include the mass (weight) of the pan assembly. Report the values in multiples of 5 lb above 30 lb and in multiples of 3 lb below 30 lb.
12. Precision and Bias
12.1 The precision and this test method as determined by the statistical examination of interlaboratory test results is as follows:
12.1.1 Repeatability - The difference between successive 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.
Repeatability = 30 % of the mean value
12.1.2 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, exceed the following values only in one case in twenty.
Reproducibility = 74 % of the mean value
NOTE 11 - Precision data were obtained from round-robin tests by eleven laboratories on seven paraffinic base oil blends.9 A table of raw data from the round robin is provided in Appendix X1 for information only.
NOTE 12 - The precision values given in Section 12 are considered applicable for samples having, in the long run, an average Timken OK load of 15 lbf minimum.
13. Keywords
13.1 EP; extreme pressure; load carrying capacity; lubricant; Timken
