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 48 of 460

FED-STD-791D

Method 353.1

September 30, 1986

EVAPORATION

1. SCOPE

1.1 This method is used for determining the tendency of oil to form a hard or tacky

residue upon evaporation.

2. SUMMARY

2.1 It consists of heating an oil-coated glass slide in an oven, at the temperature and for

the time required by the specification, and reporting the condition of the residue.

3. SAMPLE SIZE

3.1 As needed, usually less than 100 mL.

4. REFERENCES, STANDARDS, AND APPARATUS

4.1 Slide, microscope, glass.

4.2 Oven, gravity-convection, specified temperature within 0.5�C ("1� F).

4.3 Thread or wire, heat-resistant (for suspending slide in oven).

4.4 Beaker, 250 mL (for immersing the slide in the sample).

5. MATERIALS

5.1 This section is not applicable to the test procedure.

6. PROCEDURE

6.1 Heat oven to specified temperature "0.5�C ("1�F).

6.2 Cut notches near one end of slide so that it can conveniently be suspended by a

thread or wire.

6.3 Immerse slide in oil at room temperature.

6.4 Remove slide from oil, and suspend it in oven for the specified time.