ASTM D525 Test Method for Oxidation Stability of Gasoline (Induction Period Method)
12. Report
12.1 Report the Induction period at 100°C, calculated as in 11.2 to the nearest 1 min.
12.2 If the test was stopped prior to observing the pressure drop required in 10.2, but after the product specification was exceeded, then report the result as being greater than N min, where N is the product specification in min.
13. Precision and Bias
13.1 The precision of the test method as determined by statistical examination of interlaboratory test results is as follows:
13.1.1 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: 5 %.
13.1.2 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: 10 %.
13.2 Bias - There being no criteria for measuring bias in these test-product combinations, no statement of bias can be made.
NOTE 8 - The precision values given above for induction period were obtained using a boiling water bath only as the heat source. Therefore, these precision values are not necessarily applicable to induction period results obtained using other heat sources.
14. Keywords
14.1 breakpoint; gasoline; induction period; oxidation stability
