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 319 of 460

FED-STD-791D

6.3 Three test panels are processed as follows:

a. Dip the test panels in the test sample at a temperature of 25�  3�C (77�  5�F)

and agitate gently for one minute.

b. Suspend the panels by means of Monel or stainless steel hooks and drain for 2 h

at 25�  3�C (77�  5�F) and a maximum of 50 percent relative humidity.

c. Place the panels in the humidity cabinet described in Appendix I of ASTM D

1748 for the time required by the applicable specification.

d. Dummy panels, fabricated from monel or stainless steel, are used to fill all

spaces not occupied by test panels. They are also placed under the three arm

supports of the rotating stage.

6.4 At the end of the exposure period, remove the panels and rinse in methyl

alcohol. Follow with a rinse in naphtha and methyl alcohol and examine the significant

area of the test surface as defined in Appendix I of ASTM D 1748, using a 15-watt,

shaded fluorescent light.

7. CALCULATIONS

7.1 This section is not applicable to the test procedure.

8. REPORTING

8.1 Record the extent of corrosion as follows:

a. The number of rust dots, 0.1 cm in diameter or less.

b. The number of rust spots, 0.1 to 0.2 cm in diameter.

c. The number of rust areas, greater than 0.2 cm in diameter.

9. PRECISION

9.1 Precision data have not been developed for this method.

Method Prepared by:

Army - AR - 1986

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