ASTM D5483 Test Method for Oxidation Induction Time of Lubricating Greases
ASTM D5483 Standard Test Method for Oxidation Induction Time of Lubricating Greases by Pressure Differential Scanning Calorimetry
11. Report
11.1 Report the following information:
11.1.1 Report, to the nearest tenth of one minute, the average value calculated in 9.12 as the oxidation induction time (OIT) for the sample.
11.1.2 Report the test temperature.
12. Precision and Bias
12.1 The precision of this test method as determined by the statistical examination of interlaboratory test results involving eleven samples, five laboratories, three test temperatures (155, 180, and 210°C), and oxidation induction times of from 9.0 to 45.3 minutes is as follows.
12.1.1 Determinability - The difference between the pair of determinations averaged to obtain a test result would, in the long run, in the normal and correct operation of the test method, exceed the following value in only one case in twenty:
Determinability = 0.59√m
where:
m = the mean of the two determinations
12.1.2 Repeatability - The difference between successive results (each the mean of a pair of determinations) obtained by the same operator with the same apparatus under constant operating conditions on identical material, would in the long run, in the normal and correct operation of the test method, exceed the following value in only one case in twenty:
Repeatability = 0.42√m
where:
m = is the mean of the two results
12.1.3 Reproducibility - The difference between two independent results (each the mean of a pair of determinations) obtained by different operators working in different laboratories would, in the long run, exceed the following value only one case in twenty:
Reproducibility = 0.71√m
where:
m = the mean of the two test results.
12.2 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.
13. Keywords
13.1 differential scanning calorimetry; lubricating grease; OIT; onset temperature; oxidation; oxidation coefficient; oxidation induction time; PDSC; thermal analysis
