12. Report
12.1 Report the following information:
12.1.1 Sampling date and date of test (see 8.3).
12.1.2 Aging time at 150°C.
12.1.3 Percent reflectance filter pad rating as the average of duplicate determinations, to the nearest whole percent.
13. Precision and Bias
13.1 Precision - The precision of this test method as determined by statistical examination of interlaboratory 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 normal and correct operation of the test method, exceed the following values in only one case in twenty:
where:
x = the average of two results in percent reflectance.
13.1.2 Reproducibility - The difference between two independent test 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 in only one case in twenty:
where:
x = the average of two results in percent reflectance.
13.2 Bias - Since there is no accepted reference material for determining the bias for this test method, bias cannot be determined.
14. Keywords
14.1 distillate fuels; fuel insolubles; high temperature stability; storage stability; thermal stability