MIL-C-47244A (MI)
standard 603 Semco compound gun cartridge, or equivalent, having a Semco 254
nozzle with an orifice diameter of not less than 0.120 inch nor greater than 0.130 inch.
The gun and resin system shall be maintained at standard conditions throughout the
test. The gun shall be attached to a constant supply of air or inert gas at not less than 85
psig not more than 95 psig. From two to three inches of the resin system shall be
extruded initially to clear trapped air. At the end of 60 minutes, measured from the
time mixing was begun, the resin system shall be extruded onto a suitable receptacle
for 1 minute. The amount of resin system extruded during the 1-minute period shall be
weighed and shall be not less than 20 g.
4.6.4 Flow. The flow test shall include initial flow and flow at the end of the
application time and shall be conducted with a test jig as shown in figure 1. The flow
test jig shall be placed on a table with the front face upward and with the plunger
depressed to the limit of its travel. The application gun shall be filled and attached to
the pressure source as specified in 4.6.3. Within 15 minutes after the beginning of the
mixing, enough of the mixed resin system shall be extruded from the application gun
to fill the recessed cavity of the jig. The resin system shall not be worked with the gun
tip or a spatula but shall be leveled off even with the block by scraping with a spatula
in two passes, each starting in the center and moving toward the sides of the jig.
Within 10 seconds after the leveling operation, the jig shall be placed on its base and
the plunger immediately advanced to the limit of its forward travel. The initial flow
measurement shall be taken not less than 25 nor more than 35 minutes after the resin
system has been applied to the test jig. The flow shall be measured from the point
tangent to the lower edge of the plunger to the farthest point to which flow has
occurred. The measured flow shall be not more than 0.3 inch. The flow test shall be
repeated not less than 55 nor more than 65 minutes after the beginning of the mixing of
the resin system. The final flow measurement shall be taken not less than 25 nor more
than 35 minutes after the resin system has been applied to the test jig.
4.6.5 Hardness. Hardness tests for the resin system shall be in accordance with
ASTM D 2240, except as follows:
4.6.5.1 Test panels. Test panels for the hardness tests shall be as specified in
4.5.2, except as follows:
a.
Thickness of the cured resin system shall be not less than 0.150 inch nor
more than 0.1875 inch.
b.
The resin system shall be cured in accordance with conditions 1 and 2 of
table I for first article testing, and in accordance with condition 3 of
table I for quality conformance testing.
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