FED-STD-791D
d. Cool the panels in a desiccator until further processing.
e. Test panels must be handled with a panel hook at all times, avoiding contact with any
type of contaminated surface.
f. Maintain the solvents at a temperature high enough to keep the temperature of the
panels above the dew point during the cleaning operation.
6.2 Sandblast the panels as follows:
a. Sandblast the edges and lightly sandblast the back of the panels with silica sand.
b. Sandblast the unnumbered side, or test surface, of the panels to a fresh, uniformly
abraded surface.
c. Immediately after sandblasting, place the panels in a beaker of anhydrous methyl
alcohol.
d. Heat the methyl alcohol so that the solvent will evaporate from the panels immediately
upon withdrawal from the solvent.
e. Remove remaining residue by holding the panels in a rack at 20 from the vertical and
spraying downward with naphtha.
f. Spray the test surface, then the back of the panel and the test surface again.
g. Rinse the panels in hot naphtha and hot methyl alcohol and store in a desiccator until
cool.
h. Panels are to be used the same day as prepared.
NOTE 1:
Caution. Methyl alcohol and naphtha are both toxic and flammable. Do not
permit them to come in contact with the skin or breathe their fumes. Use only
in a well ventilated area. Keep all flames away from these materials.
6.3 Three test panels are processed with the original oil as follows:
a. Dip the panels into distilled water, momentarily, and drain in a vertical position for not
more than 5 s, with the bottom edge in contact with absorbent tissue.
b. Immerse the panels horizontally, and without agitation, for 15 s in a petri dish
containing 50 mL of the test sample maintained at 25 3C (7.70 5F) and 50%
maximum relative humidity.
c. Drain the panels momentarily and place in the static humidity chamber for 1 h at 25
3C (77 5F).
d. At the completion of the static humidity exposure, remove the panels and rinse in
methanol.
83
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business