ASTM D3117 Test Method for Wax Appearance Point of Distillate Fuels
9. Report
9.1 The temperature at which the wax crystals are obviously present is the wax appearance point and is reported to the nearest 0.2°C.
10. Precision and Bias
10.1 Precision - The precision of this test method obtained by the statistical examination of interlaboratory test results is as follows:
10.1.1 Repeatability - The difference between two test results obtained by the same operator with the same apparatus under constant operating conditions on the same fuel sample would, in the long run, in the normal and correct operation of the test method, exceed 0.8°C only in one case in twenty.
10.1.2 Reproducibility - The difference between two single and independent results obtained by different operators working in different laboratories on the same fuel sample would, in the long run, in the normal and correct operation of the test method, exceed 2.2°C only in one case in twenty.
10.2 Bias - Because liquid hydrocarbon standards of known wax appearance point are not available, no statement of bias can be made.
NOTE 4 - These precision data were obtained in a cooperative program among eight laboratories testing eight fuels for both wax appearance point and cloud point by Test Method D2500. None of the fuels contained wax crystal modifying additives.
11. Keywords
11.1 distillate fuels; wax
