ASTM D5621 Standard Test Method for Sonic Shear Stability of Hydraulic Fluids
9. Report
9.1 Report the initial and irradiated 40°C viscosity of the hydraulic fluid.
10. Precision and Bias
10.1 Repeatability - The difference between two independent 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, differ from the mean by greater than 0.38 mm2/s (cSt) in only one case in twenty.
10.2 Reproducibility - The difference between two 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, differ from the mean by greater than 0.60 mm2/s (cSt) in only one case in twenty.
10.3 Bias - The bias of this test method has not been determined because there is insufficient data on the relevant reference (test) standard.
11. Keywords
11.1 hydraulic fluid; shear stability; sonic shear test; viscosity stable
