FED-STD-791D
4.2.5 Balance, sensitivity, 0.1 mg.
4.2.6 Dies and cutters - ASTM die A or equivalent so that width of rubber specimen
suspended between jaws of tensile tester is 1.27 cm (1/2 in).
4.2.7 Durometer - Standard shore durometer or equivalent.
4.2.8 Micrometer - To measure thickness of rubber.
4.2.9 Tension testing machines - Scott tensile tester model L or equivalent for rubber
testing.
4
d .2.10 Borosilicate tubing - thermocouple holder closed at one end, 18 cm length
0.3
cm insi e diameter 0.5 cm outside diameter.
4.2.11 Thermocouple and recorder - to record temperature of test oils.
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 Standard silicone test rubber sheets, may be obtained from Naval Air Propulsion Test
Center, Trenton, New Jersey 08628. Test sheets should be 15 15 cm (6 6 in) by 0.19 cm
thick (0.075 in) as per U.S. Air Force Specification bulletin 539, Standard Elastomer Stocks.
5.3 Cleaning solution, glass (concentrated sulfuric acid [3,0,2] saturated with potassium
or sodium dichromate [1,0,1]).
5.4 Methyl alcohol, ACS, particle-free [1,3,0].
5.5 Solvent - naphtha [1,4,0] or toluene [2,3,0] ACS.
5.6 Acetone, ACS, particle free [1,3,0].
6. PROCEDURE
6.1 Definitions
6.1.1 Tensile stress - the applied force per unit of original cross sectional area of
specimen.
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