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 52 of 460

FED-STD-791D

4.3.9 Temperature control. The cabinet or oven shall be insulated, and shall be equipped

with suitable means of heating and cooling to provide the specified test temperatures. The

temperatures shall be thermostatically controlled within "2.8�C ("5�F) of the specified test

temperature.

4.3.10 Durometer, Type A-shore durometer. The description of the durometer,

calibration, and application in testing rubber hardness may be found in ASTM D 2240.

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.

5.2 Ethyl alcohol, (ACS) [0, 3, 0].

5.3 Crocus cloth. Crocus cloth shall conform to the requirements of ANSI B74.18.

5.4 Wheel cylinder assemblies. Four cast iron housing straight bore hydraulic brake

wheel cylinders having a diameter of approximately 2.8 cm (1-1/8 in). SAE part number

RM-14a.

5.5 Master cylinder assembly. One cast iron housing hydraulic brake master cylinder

having a diameter of approximately 2.8 cm (1-1/8 in.) and fitted with an uncoated steel

standpipe. SAE part number RM-15a.

5.6 Rubber cups. All wheel cylinder and master cylinder cups used in the test brake

system shall be made of SBR type elastomer. SAE part numbers for wheel cylinders and master

cylinders are RM-3, RM-4 and RM-5.

5.7 Wheel cylinder pistons. Unanodized aluminum pistons (SAE RM-12) made from

SAE AA 2024 aluminum alloy are to be used.

5.8 Master cylinder piston.

Use a SAE RM-13 piston made from SAE CA 360

copper-base alloy (half hard).

NOTE: All standard SAE parts are available from the Society of Automotive Engineers, Inc,

400 Commonwealth Drive, Warrendale, PA 15096.

6. PROCEDURE.

6.1 Preparation of the test apparatus.

6.1.1 Inspection and cleaning of parts.