ASTM D6278 Standard Test Method for Shear Stability of Polymer Containing Fluids Using a European Diesel Injector Apparatus
13. Report
13.1 Report the following information:
13.1.1 The calibration pressure, in MPa.
13.1.2 Kinematic viscosity of the unsheared oil at 100 °C.
13.1.3 Kinematic viscosity of the sheared oil at 100 °C.
13.1.4 Percent viscosity loss (PVL) as calculated in 12.1.
14. Precision and Bias
14.1 The precision of this test method as determined by the statistical examination of interlaboratory test results is as follows:
14.1.1 Repeatability - The difference between successive test results, obtained by the same operator with the same apparatus under constant operating conditions on identical test material would, in the long run, and in the normal and correct operation of the test method, exceed the following values only in one case in twenty:
1.05 %
14.1.2 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, and in the normal and correct operation ofthe test method, exceed the following values only in one case in twenty:
2.68 %
NOTE 19 - The indicated repeatability and reproducibility values for PVL represent the subtractive difference between the reported percent kinematic viscosity loss values for the two determinations being compared.
14.2 Bias - All test results are relative to those of the calibration fluid. Therefore, no estimate ofbias can be justified.
15. Keywords
15.1 diesel injector apparatus; mechanical shear stability; polymer containing fluid; viscosity loss
