ASTM D5304 Standard Test Method for Assessing Middle Distillate Fuel Storage Stability by Oxygen Overpressure
12. Report
12.1 Report the total insolubles to the nearest 0.1 mg/100 mL for each sample replicate.
13. Precision and Bias
13.1 Precision - The precision of this test method, as determined by the statistical examination of interlaboratory test results, is as follows:
13.1.1 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:
Repeatability = 0.2 (X + 1.3)
where:
X = the average of two results in mg/100 mL.
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, exceed the following values only in one case in twenty:
Reproducibility = 0.9 (X + 1.3)
where:
x = the average of two results in mg/100 mL.
NOTE 3 - The interlaboratory testing involved nine laboratories and twelve middle distillate fuel samples. The average potential storage stability of the twelve samples ranged from 0.6 mg/100 mL to 3.2 mg/100 mL. The precision statement is applicable for all conditions and apparatus in this test method except Appendix X1.
13.2 Bias - The nature of this test and the parameters being measured are such that a true bias statement cannot be written.
14. Keywords
14.1 distillate fuels; fuel insolubles; oxidative stability; oxygen overpressure; stability; storage stability
