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 Solvent, dry-cleaning (A-A-59601D).
5.3 1,1,1-Trichloroethane (reagent grade) [2,1,0].
5.4 Acetone (ACS) [1,3,0].
5.5 Nitric acid solution (3 parts concentrated nitric acid and 7 parts distilled
water) [2,0,0].
5.6 Pumice, FFF grade.
5.7 Eraser (Eberhard Faber "Pink Pearl" No. 100, or equivalent).
5.8 Cleaning solution, glass (concentrated sulfuric acid [3,0,2] saturated with
potassium or sodium dichromate [1,0,1], technical grade).
NOTE: If the glass-cleaning solution cannot remove all deposits (see 6.1) use a
special cleaner, such as Turco Transpo cleaner (Turco Products Co., Chicago,
IL).
5.9 Distilled water.
6. PROCEDURE
6.1 Clean two glass supports and two 400-mL beakers as follows:
a. Rinse with dry-cleaning solvent to remove excess oil.
b. Place each support in its beaker, and fill each beaker with glass-cleaning
solution. Let them stand for at least 8 h or until all traces of deposits are
removed.
c. Remove from the glass-cleaning solution, and rinse the glassware with
running tap water followed by distilled water.
6.2 Handling only with tongs, clean the copper and silver strips in separate bath
solutions as follows:
a. Wash with dry-cleaning solvent.
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