ASTM D6138 Method for Corrosion-Preventive Properties of Lubricating Greases
ASTM D6138 Standard Test Method for Determination of Corrosion-Preventive Properties of Lubricating Greases Under Dynamic Wet Conditions (Emcor Test)
11. Report
11.1 Report the degree of corrosion and the type of water solution used for the test in accordance with one of the classifications and descriptions in Table 1. If the two ratings agree within the precision given for repeatability, report the two figures, otherwise make two further determinations.
NOTE 3 - To assist in estimating percentage corrosion area, a transparent grid divided into suitable squares can be used.
12. Precision and Bias
12.1 Precision - The precision of this test method, as determined by statistical examination of interlaboratory results, is as follows:
12.1.1 Repeatability - The difference between successive test results, obtained by the same operator with the same apparatus under constant operating conditions on identical test material, in the normal and correct operation of the test method, would exceed the values shown in Table 2 only in one case in twenty.
12.1.2 Reproducibility - The difference between two single and independent results, obtained by different operators working in different laboratories on nominally identical test material, in the normal and correct operation of the test method, would exceed the values shown in Table 2 only in one case in twenty.
NOTE 4 - The precision is based on that adopted by the ISO committee from the IP Precision Evaluation Panel reports issued on June 27, 1979 and January 28, 1980, for the IP 220 round robin performed in 1965. A copy of these reports is available from ASTM Headquarters.
12.2 Bias - The procedure for determining the corrosion preventive properties of grease has no bias because the value of corrosion is defined only in terms of this test method.
13. Keywords
13.1 corrosion; Emcor test; lubricating grease; rust
