ASTM D5969 Test Method for Corrosion-Preventive Properties of Lubricating Greases
ASTM D5969 Standard Test Method for Corrosion-Preventive Properties of Lubricating Greases in Presence of Dilute Synthetic Sea Water Environments
12. Report
12.1 The reported result shall be the pass or fail rating as determined by at least two of the three bearings at the percentage of dilute synthetic sea water of interest.
13. Precision and Bias
13.1 Due to the nature of the results, the precision of this test method was not obtained in accordance with RR:D02-007, "Manual on Determining Precision Data for ASTM Methods on Petroleum Products and Lubricants".
13.2 Precision - The precision of this test method as determined by statistical examination of interlaboratory results is as follows:
13.2.1 Repeatability may be judged by the fact that 92 % of duplicate results obtained by six laboratories at four concentrations of synthetic sea water (0 %, 5 %, 10 %, and 100 %) with eight samples were in agreement.
13.2.2 Reproducibility may be judged by the fact that six laboratories matched consensus 77 % of the time at four concentrations of synthetic sea water (0 %, 5 %, 10 %, and 100 %) with eight samples showing good or poor protection against corrosion.
13.3 Bias - No statement is made about the bias of this test method since the result merely states whether there is conformance to the criteria for success specified in the procedure.
14. Keywords
14.1 corrosion; lubricating grease; synthetic sea water
