PLTL-39 Flammability, SAE AS8660 (Formerly Mil-S-8660C)
Silicone lubricants intended for electrical applications need to be non-flammable and heat-stable. This test determines the flammability of a test silicon compound and its vapors.
A sample is placed on a steel screen and torched with a Bunsen burner until it begins to decompose. The vapors are also torched. If neither the vapors nor the grease ignites and maintains a self-supporting flame, a “pass” is reported.