FED-STD-791D
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.
5.2 500 mL of sodium hydroxide solution containing approximately 25% NaOH
by weight [3,0,1].
5.3 n-Hexane, commercial [1,3,0].
5.4 1,1,1-Trichloroethane (ASTM D 4126).
5.5 Distilled water.
5.6 Cleaning tissue.
5.7 Two copper strips, approximately 76 13 cm by 0.32 cm (3 l/2
1/8 in)
(ASTM B 152/152M, electrolytic tough pitch, cold-rolled, half-hard temper).
5.8 Two brass strips, approximately 76 13 0.32 cm (3 1/2 1/8 in) (ASTM
B 121/B 121M, ASTM B 36/ B 36M, composition 2 [cartridge brass], half-hard temper).
5.9 Two cast iron strips, approximately 76
13
0.32 cm ( 3
1/2
1/8 in)
(ASTM A 48, class 20, strip only).
5.10 Two steel strips, approximately 76 13 0.32 cm (3 1/2 1/8 in)
(QQ-S-698, physical quality, cold-rolled, half-hard temper - CR half-hard No. 2 temper).
6. PROCEDURE
6.1 Prepare two strips of each type of metal listed in section 4 in accordance with
ASTM D 130.
6.2 Using the forceps, place one strip of each type of metal in a separate test tube.
Place the duplicate strips in a bottle filled with the normal hexane. Keep this bottle
tightly stoppered until time to examine the strips.
NOTE: Caution. Normal hexane is flammable. Use only in a well ventilated area.
Keep all flames away from the normal hexane.
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