PLTL-19 Water Solubles per SAE AMS-M-7866
Molybdenum disulfide is a water-insoluble, mined product with excellent lubricity. Water-soluble contaminants may change the properties and stability of lubricants formulated with MoS2. This test determines the quantity of water-soluble contaminants in MoS2 samples.
A carefully weighed sample is placed in a Soxhlet thimble and extracted with water. The thimble is dried, again carefully weighed and the percent of water-soluble compounds is determined. A pass is reported if less than 0.5% of water-soluble material is present in the sample. (Note: This dried and cleaned sample in the thimble is retained for use in PLTL-20 if required.)