PLTL-41 Corrosive Effects-Metals, SAE AS8660 (Formerly Mil-S-8660C)
Metals in the electrical systems of aircraft and motor vehicles may be exposed to silicone lubricants in the system. This test is intended to ensure that the silicone lubricant does not pit or etch the metals as specified by SAE AS8660.
Metals are polished, coated with the test grease and heated for the test time at the test temperature. The metals are cleaned and examined for changes. If no etching or pitting is observed, a pass is reported. Other observations such as staining or discoloration of the metals may also be made.