ASTM D4048 - Detection of Copper Corrosion from Lubricating Grease
Signiﬁcance and Use
5.1 This test method measures the tendency of lubricating grease to corrode copper under speciﬁc static conditions. It may be of some value in predicting possible chemical attack on lubricated parts, such as bearings that contain copper or copper alloys. Such corrosion, for example, can cause premature bearing failures. However, no correlations with actual ﬁeld service, most of which are under dynamic conditions, have been established. It does not measure either the ability of the lubricant to inhibit copper corrosion caused by factors other than the lubricant itself nor does it measure the stability of the grease in the presence of copper.
1.1 This test method covers the detection of the corrosive-ness to copper of lubricating grease.
Extracted, with permission, from ASTM D4048-19a - Detection of Copper Corrosion from Lubricating Grease, copyright ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428. A copy of the complete standard may be purchased from ASTM International, astm.org