ASTM D4627 Test Method for Iron Chip Corrosion for Water-Miscible Metalworking Fluids
9. Report
9.1 Report as "breakpoint" the weakest concentration tested that left no rust stain on the filter paper.
9.2 Report the estimated percentage of rust stain on the filter paper for each concentration tested.
10. Precision and Bias
10.1 Precision - The precision of this test method as determined by the statistical examination of interlaboratory test results is as follows (see Table 1):
10.2 Repeatability - The difference between two 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.
Repeatability = 0.64 for sample Nos. 1, 3, 4, and 5
10.3 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.
Reproducibility = 1.85 for sample Nos. 1, 3, 4, and 5
10.4 Bias - The procedure in this test method for iron chip corrosion test for water-miscible metalworking fluids has no bias because the Corrosion Values can be defined only in terms of a test method.
11. Keywords
11.1 corrosion test; ferrous corrosion test; iron chip corrosion test; metalworking fluid corrosion test; water-miscible fluids corrosion test
