ASTM D4539 Test Method for Filterability of Diesel Fuels by Low-Temperature Flow Test (LTFT)
8. Report
8.1 Report the temperature of the last passing result recorded in 7.14 as:
Minimum LTFT Pass Temperature =_______°C.
8.2 Alternatively, report the result recorded in Step 7.15 as:
Pass or Fail at ________°C.
9. Precision and Bias
9.1 Precision - The precision data were obtained in a cooperative program in which fuels were investigated over the temperature range from -10 to -25°C. The precision of this test method as determined by the statistical examination of interlaboratory test results is as follows:
9.1.1 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 value only in one case in twenty.
Repeatability = 2°C
9.1.2 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 value only in one case in twenty.
Reproducibility = 4°C
9.2 Bias - There being no criteria for measuring bias in these test product combinations, no statement of bias can be made.
10. Keywords
10.1 diesel fuel; filterability; flow; low temperature; LTFT
