ASTM D7098 Standard Test Method for Oxidation Stability of Lubricants by Thin-Film Oxygen Uptake (TFOUT) Catalyst B
11. Report
11.1 Report the oxidation induction time in minutes. Determine the induction time as the time period from the beginningof the test (Point A, Fig. 1) to the break point (Point B, Fig. 1).
12. Precision and Bias
12.1 The precision of this test method, as determined by statistical examination of interlaboratory results on break point time, 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:
14 % of mean
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, in the normal and correct operation of the test method, exceed the following values only in one case in twenty:
39 % of mean
12.2 The range of induction times used for developing this precision statement was from 40 to 280 min.
12.3 Bias - No information can be presented on the bias of the procedure in this test method for measuring oxidation stability because no material having an accepted reference value is available.
12.4 The precision statements in 12.1.1 and 12.1.2 were determined from an interlaboratory study using the same batch of soluble metal mixture (TFOUT Catalyst B Package of Chongqing Kailian Yongrun Industrial Co.,Ltd.).
13. Keywords
13.1 oxidation stability; sequence IIIE engine simulation; TFOUT
