FED-STD-791D
5. MATERIALS
5.l 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 Test panels, FS 1009 steel, 5.1 7.6 0.16 cm ( 2 3 l/16 in), fabricated from
open hearth "killed" type low carbon, No. 4 soft temper cold rolled sheet or strip conforming to
QQ-S-698. Cold drawn bar stock is not satisfactory.
5.3 Naphtha, aliphatic (TT-N-95) [1,4,0].
5.4 Methyl alcohol (O-M-232) [1,3,0].
5.5 Distilled water.
5.6 Silica sand, white dry, sharp. The size shall be such that it meets the following sieve
requirements ASTM E11:
a. 100% must pass through a No. 10 sieve.
b. Minimum of 90% must pass through a No. 20 sieve.
c. Maximum of 10% permitted to pass through a No. 50 sieve.
5.7 Surgical gauze.
5.8 Absorbent tissue.
5.9 Emulsion, water and oil prepared as follows:
a. Place 50 mL of the test sample and 5 mL of distilled water in a 125-mL Erlenmeyer
flask.
b. Shake mixture thoroughly and store overnight in an oven a 54 1C (130 2F).
c. Remove from oven and cool at 25 3C (77 5F) for testing.
d. Shake the mixture immediately prior to placing in the petri dish.
6. PROCEDURE
6.1 Clean the steel panels as follows:
a . Round the edges and ream out the suspension holes in accordance with ASTM D 1748.
b. Wipe the surfaces with solvent soaked rags and scrub with surgical gauze swabs in a
beaker of hot naphtha.
c. Rinse in a beaker of hot methyl alcohol.
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