ASTM D6186 Test Method for Oxidation Induction Time of Lubricating Oils
ASTM D6186 Standard Test Method for Oxidation Induction Time of Lubricating Oils by Pressure Differential Scanning Calorimetry (PDSC)
9. Report
9.1 Report, to the nearest minute, the oxidation induction time (OIT) for the sample.
9.2 Report the test temperature.
10. Precision and Bias
10.1 Precision - The precision of this test method was determined in accordance with currently-accepted guidelines in the Committee D-2, "Manual on Determining Precision Data for ASTM Methods on Petroleum Products and Lubricants". Eight laboratories evaluated thirteen samples at four different test temperatures (130, 155, 180, and 210°C) in the round robin and reported oxidation induction times ranged from 10 to 119 min. Appendix X2 lists round robin data and PDSC equipment used by cooperators.
10.1.1 Repeatability - The difference between successive 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 one case in twenty:
r = 0.17 m
where
m = average of the two test results.
10.1.2 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 normal and correct operation of the test method, exceed the following values only one case in twenty:
R = 0.35 m
where:
m = average of the two test results.
10.2 Bias - The procedure in this test method has no bias because the value of oxidation induction time can be defined only in terms of a test method.
11. Keywords
11.1 differential scanning calorimetry; lubricating oil; OIT; onset temperature; oxidation; oxidation coefficient; oxidation induction time; PDSC; thermal analysis
