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ASTM D6375 - Evaporation Loss of Lubricating Oils by Thermogravimetric Analyzer (TGA) Noack Method

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.


1.1 This test method covers the procedure for determining the Noack evaporation loss of lubricating oils using a thermo-gravimetric analyzer test (TGA). The test method is applicable to base stocks and fully formulated lubricant oils having a Noack evaporative loss ranging from 0 % to 30 % by mass. This procedure requires much smaller specimens, and is faster when multiple samples are sequentially analyzed, and safer than the standard Noack method using Wood’s metal.

1.2 The evaporative loss determined by this test method is the same as that determined using the standard Noack test methods.

Extracted, with permission, from ASTM D6375-09 - Evaporation Loss of Lubricating Oils by Thermogravimetric Analyzer (TGA) Noack Method, copyright ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428. A copy of the complete standard may be purchased from ASTM International,