ASTM D2070 Standard Test Method for Thermal Stability of Hydraulic Oils
10. Report
10.1 Report the color of the copper and steel rods as previously determined.

10.2 Report the total sludge in mg/100 mL oil.

11. Precision and Bias
11.1 The precision of this test method was determined by a statistical analysis of interlaboratory test results. The following criteria should be used for judging the acceptability of data.

11.2 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, in the normal and correct operation of the test method, exceed the following values only in one case in twenty:
Copper rod color - 1 unit
Steel rod color - 1 unit
Total sludge - 1.04 (X + 1)
where X denotes mean value.

11.3 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, exceed the following values only in one case in twenty:
Copper rod color - 4 units
Steel rod color - 2 units
Total sludge - 3.25 (X + 1)
where X denotes mean value.

11.4 Bias - Since there is no accepted reference material suitable for determining the bias for the procedure, bias has not been determined.

12. Keywords
12.1 thermal stability; hydraulic oils; oil sludging; copper corrosion; steel corrosion; Cincinnati Milacron; heat test