THERMAL STABILITY OF SOLID FILM LUBRICANTS: D2511
EXPLANATION
Solid lubricant coatings are applied to surfaces that are exposed to heat and cold to such a degree that in many cases liquid lubricants are not practical. Adherence under these conditions is mandatory to preserve the bearing surfaces during sliding motion. This test method covers the measurement of the resistance of dry solid film lubricants to deterioration when subjected to temperature extremes.
TEST SUMMARY
A steel panel having the solid film lubricant deposited on one surface is subjected to 260° C (500° F) heat followed by immediate exposure to -54° C (-65° F), each for a period of 3 h. The solid film is then examined for cracking, flaking, blistering, or other evidence of thermal instability.
TEST PRECISION
This is a pass-fail test, and the normal precision or bias statements are not applicable.
