ASTM D3342 Test Method for Dispersion Stability of New (Unused) Rolling Oil Dispersions in Water
9. Report
9.1 The test result should be reported by the form in Fig. 1, or equivalent. Calculations of Slope b (see 8.4) are to be used to test the precision of test method and define the stability of the dispersion by a single number.
10. Precision and Bias
10.1 Precision - The precision of the test method as obtained by statistical examination of interlaboratory test results is as follows:
10.1.1 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, in the normal and correct operation of the test method, exceed the following value only in one case in twenty:
0.0736 slope
10.1.2 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 value in only one case in twenty:
0.3028 slope
10.2 Bias - Since there is no accepted reference material suitable for bias determination of this test method, no statement on bias is being made.
NOTE 2 - The precision statement is based on the results from seven laboratories on six samples (see Table 1). The results of the cooperative test program, from which these values have been derived, are filed at ASTM Headquarters as Research Report #RR:D02-1108.
11. Keywords
11.1 coolant; dispersion stability; emulsion; rolling oil
