FED-STD-791D
5.3 Cord (cotton, nylon, or linen), light-weight, clean (for tying metal squares
together).
NOTE 3:
A fine stainless steel wire may be used to tie the metal squares together
when a test temperature of over 204C (400F).
5.4 Abrasive paper (silicon carbide or alumina), various grades of grit.
5.5 Abrasive paper, silicon carbide, 240 grit.
5.6 Silicon carbide grains, 150 mesh.
5.7 Cotton, absorbent.
5.8 1,1,1-Trichloroethane (ASTM D 4126).
5.9 Acetone (ACS), sulfur-free [1,3,0].
5.10 Laboratory filter paper.
5.11 Naphtha, Aromatic (TT-N-97) [1,4,0].
6. PROCEDURE
6.1 Determine the acid number of the sample by method ASTM D 664 or D 974,
whichever is applicable.
6.2 Determine the viscosity in centistokes of the sample by method ASTM D 445
at 40C unless otherwise specified.
6.3 Wash a length of the cord by boiling it in distilled water for 10 min, and
allow it to dry.
6.4 Prepare the solid cadmium squares by removing any burrs from the drilled
holes.
6.5 Prepare the aluminum copper, magnesium, and steel squares. For testing
spindle oil, use only metal squares of copper and steel. The squares are prepared as
follows:
6.5.1 Using progressively finer grades of abrasive paper, remove all surface
blemishes from both sides and all four edges of each square, and any burrs from the
drilled holes.
NOTE 4.
Caution. In all succeeding steps, handle the squares with tongs or filter
paper only, until the final weighing (see 6.11).
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