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3.7.2 Sprayable material finish. The spray gun shall provide the capability to
apply black to charcoal color pigmented acrylic paint over a 3 feet by 3 feet square
area with a coating finish equal to or better than the commercial automotive
passenger car finish provided by General Motors, Ford, Chrysler, and American Motors
(see Figure 3).
3.7.3 Spray pattern. The spray guns shall produce a round pattern with the
pattern control valve closed, and a symmetrical fan spiny pattern with the pattern
control valve open (see Figure 1). The minimum effective dimensions of the spray
pattern shall be that area of the pattern which has 100 percent coverage. The spray
guns shall not produce any defective patterns as shown in Figure 2, namely a heavy
bottom or top pattern, a heavy left or right side pattern, or a heavy center, or
split pattern. The spray pattern shall not change in shape when the air cap is
rotated. The spray guns, when filled with a pigmented alkyd gloss enamel exterior
automotive paint conforming to TT-E-489 Type I, Class A, black to charcoal in color,
having a viscosity of 25 to 30 seconds using a Number 4 Ford cup at +77 degrees F.
plus/minus 5 degrees F., shall produce the symmetrical fan and round spray pattern
as specified in Table I without any paint runs within the pattern area, when held
stationary and perpendicular to the spraying surface at a distance of 7.5 to 8.5
inches inclusive and operate for not more than one second. In accordance with 3.2,
the spray gun shall produce round and symmetrical spray patterns, in accordance with
Figure 1; then, the spray gun shall be completely disassembled and thoroughly cleaned
and all packing, gaskets, and other seals, shall be replaced. The spray gun shall
be reassembled and retested for the round and symmetrical spray patterns in
accordance with Figure 1.
3.8 Air consump tion and fluid pressure.
3.8.1 Air consumption. The spray guns shall produce the normal spray patterns
specified in Figure 1 and 3.7.3 within the air consumption, liquid flow, and air
pressure limits specified in Table II.
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