10. Report
10.1 Report the total amount of leakage of grease or oil, or both, into the collector and into the hub cap.
10.2 Report the presence on the bearing surface of any adherent deposit of varnish, gum, or lacquer-like material, which is evident after removal of the grease (Note 11).
11. Precision and Bias
11.1 The precision of this test is not known to have been obtained in accordance with currently accepted guidelines (for example, in Committee D-2 Research Report RR:D2-1007.
11.2 The precision of the test method as determined by statistical examination of interlaboratory results is as follows:
11.2.1 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:
11.2.2 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:
11.3 Bias - The procedure in Test Method D1263 for measuring leakage tendencies of automotive wheel bearing greases has no bias because the value of leakage can be defined only in terms of a test method.
12. Keywords
12.1 automotive wheel bearing; leakage; lubricating grease; wheel bearing grease