FED-STD-791 Lubricants, Liquid Fuels, And Related Products, Testing Method OfThis test method standard is composed of standard test methods for sampling, inspecting and testing lubricants, liquid fuels and related products. It is issued pursuant to the Federal Property and Administration Services Act of 1949, as amended and its application to the purchase of commodities referred to herein is mandatory on all Federal agencies.

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'�NOTE:This draft dated 15 April 2006' by DasH - Page 254 of 460

FED-STD-791D

Method 3720.2

September 30, 1986

MOLYBDENUM DISULFIDE CONTENT OF LUBRICATING GREASE

1. SCOPE

1.1 This method is used to determine the molybdenum disulfide content of

lubricating greases. This method does not apply to lubricating greases that contain

non-soap thickeners.

2. SUMMARY

2.1 This method consists of dissolving the base oil and soap thickener in a

mixture of oleic acid and benzene. The MoS2 is removed by filtration and MoS2 content

determined by weighing the MoS2.

3. SAMPLE SIZE

3.1 5 g of lubricating grease to be tested.

4. REFERENCES, STANDARDS, AND APPARATUS

4.1 Desiccator.

4.2 Erlenmeyer flask, 125 mL.

4.3 Filter pump (aspirator).

4.4 Flask, filtering heavy wall.

4.5 Gooch crucible and suitable holder.

4.6 Oven capable of 100�C.

4.7 Steam bath.

5. MATERIALS

5.1 CAUTION: SOME MATERIALS ARE TOXIC AND HAZARDOUS. The

chemical materials listed in this section must be handled carefully. Federal Test Method

10000, Material Handling Safety Precautions, is a reference which lists all toxic and

hazardous materials cited in FTMS 791. The synonyms, life hazard, flammability,

handling and storage precautions, emergency treatment and measures, and spill practices

of each chemical are explained.

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