ASTM D3944 Test Method for Solidification Point of Petroleum Wax
8. Report
8.1 Report the solidification point to the nearest 0.1°C.
9. Precision and Bias
9.1 The precision of this test method as determined by statistical examination of interlaboratory results is as follows:
9.1.1 Repeatability - The difference between two test results, obtained by the same operator with the same apparatus under constant operating conditions on identical 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:
Distillate waxes 0.6 °C (1.0 °F)
Residual waxes 0.7 °C (1.3 °F)
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 values only in one case in twenty:
Distillate waxes 1.2 °C (2.2 °F)
Residual waxes 2.4 °C (4.3 °F)
9.2 The precision data were obtained in an interlaboratory study involving five laboratories in which solidification points of five distillate waxes (51 to 69 °C/123 to 155 °F) and five residual waxes (53 to 85 °C/128 to 185 °F) were determined.
9.3 Bias - The procedure in this test method has no bias because the value of solidification point can be defined only in terms of a test method.
10. Keywords
10.1 petroleum wax; solidification print; wax
