ASTM D6375 Test Method for Evaporation Loss of Lubricating Oils
ASTM D6375 Standard Test Method for Evaporation Loss of Lubricating Oils by Thermogravimetric Analyzer (TGA) Noack Method
4. Summary of Test Method
4.1 A lubricant specimen is placed in an appropriate TGA specimen pan. The pan is placed on the TGA pan holder and quickly heated to between 247 and 249°C under a stream of air, and then held isothermal for an appropriate time. Throughout this process, the TGA monitors and records the mass loss experienced by the specimen due to evaporation. The Noack evaporation loss is subsequently determined from the specimen weight percent loss versus time curve (TG curve) as the mass percent lost by the specimen at the Noack reference time determined under the same TGA conditions.
5. Significance and Use
5.1 This test method is a safe and fast alternative for determination of the Noack evaporation loss of a lubricant.
5.2 The evaporation loss of a lubricant is important in the hot zones of equipment where evaporation of part of the lubricant may increase lubricant consumption.
5.3 Some lubricant specifications cite a maximum allowable evaporative loss.
