EVAPORATION LOSS OF LUBRICATING GREASES: ASTM D2595
EXPLANATION
The loss of volatile materials from greases and oils can adversely affect the original performance characteristics of a lubricant and therefore, could be a significant factor in evaluating a lubricant for a specific use. Such volatiles can also become contaminants in the environment in which the lubricant is to be used. Correlation between results from this test method, and service performance has not been established.
This test method covers the temperature range of 93 to 316° C (200 and 600° F). This test augments Test Method ASTM D972 which is limited to 149° C (300° F). This test method should not be used at temperatures that exceed the flash point of the base oil of the grease.
TEST SUMMARY
A weighed sample of grease in an evaporation cell is placed in a heating device and maintained at the desired test temperature. Heated air is passed over the grease surface for 22 +/- 0.1 h. The loss in weight of the sample due to evaporation is then determined.
TEST PRECISION
This test method has a repeatability of 10 and a reproducibility of 15 % of the mean value.
This test method has no bias.
