FED-STD-791D
5.3 Clips, (3), brass (ASTM B 121/ B 121M, ASTM B 36/B36M, composition
2), spring temper, fabricated to dimensions shown in Figure 1.
5.4 Abrasive papers, silicon-carbide or aluminum oxide, 150, 240, 400, and 600
grit.
CAUTION:
Do not use papers containing iron oxide.
5.5 Cloth, lint-free, clean, dry.
5.6 Acetone (ASTM D 329).
5.7 Etching solution, consisting of:
5.7.1 Distilled water, 450 mL.
5.7.2 Nitric acid (ACS), concentrated, 225 mL [2,0,0].
5.7.3 Sulfuric acid (ACS), concentrated, 300 mL [3,0,2].
5.7.4 Hydrochloric acid (ACS), concentrated, 8 mL [3,0,0].
5.8 Methyl alcohol (ACS), absolute [1,3,0].
5.9 Distilled water.
6. PROCEDURE
6.1 Prepare the three steel disks as follows:
6.1.1 Slush the disks in the methyl alcohol to remove traces of coolant used in
grinding.
NOTE Caution. Methyl alcohol is both toxic and flammable. Use it only in a well
ventilated area. Do not permit it to come in contact with the skin or breathe
its fumes. Keep all flames away from this material.
6.1.2 Polish the surface-ground side using 150-, 240-, 400-, and 600-grit silicon
carbide or aluminum oxide paper in succession. Perform each polishing operation at
right angles to the previous one, and continue until all cross scratches from the previous
operation are removed.
6.1.3 Clean the disks by wiping with the clean, dry, lint-free cloth, being careful
not to touch the polished surface with bare hands.
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