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ASTM D4048
The ASTM D4048 evaluates whether a grease will cause corrosion or staining of copper surfaces when exposed under controlled temperature and time conditions. After the test, the copper strip is visually examined and rated using a standard corrosion scale.
ASTM D4048 is commonly applied to lubricating greases used in bearings, automotive, and industrial applications, helping assess material compatibility and corrosion protection.
