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Physical properties of molded parts. |
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|  MIL-F-51440A(EA)
4.4.4 Tests.
4.4.4.1 Leakage. The assembled filter with emergency breathing adapter (see
6.3) attached shall be pressurized with air to 50.0 + 5 inches of water and
submerged just below the surface of the water (at room temperature) in each of
two orientations (one with front facing upwards and one with front facing
downwards) for at least 30 seconds each. Bubbles rising from this assembly
after 15 seconds of submersion for either orientation shall be cause of
The filter shall be thoroughly dried at the completion of the test.
rejection
4.4.4.2 Inhalation resistance. Inhalation resistance of the assembled fil-
ter with filter element set shall be measured using the Inhalation Resistance
Test Fixture conforming to Drawing C136-301-73.
4.4.4.3 Physical properties of molded parts. The front and back housings
shall be tested for tensile strength in accordance with ASTM D412 die D and
durometer hardness in accordance with ASTM D 2240.
5.
PACKAGING
5.1 Preservation (level A and B). Prior to unit packing (5.2.1 and 5.2.2),
loosen the two screws on clamp assembly to alleviate pressure on rubber
housing.
The filter shall be free of dirt and other foreign matter
5.1.1 Cleaning.
with unit packed.
(see 6.2).
Level shall be as specified
5.2 Unit packing.
The filter shall be unit packed in accordance with Drawing
5.2.1 Level A.
D5-3-1008.
5.2.2 Level B. The filter shall be unit packed, one each, in a fiberboard
box conforming to style FOL, grade W5c, PPP-B-636, having inside dimensions of
9-3/8 by 3-3/8 by 12-1/2 inches length, width, and depth, respectively. The
filter shall be supported in the box by a support cell as shown on Drawing
The box shall be closed in accordance with method III in the appen-
D5-3-1008.
dix to PPP-B-636.
Level shall be as specified (see 6.2).
5.3 Packing.
5.3.1 Level A. The filter unit packed in accordance with 5.2.1, shall be
packed, 5 per box in nailed wood boxes conforming to style 4, class 2, grade A,
O to 50 lb load limit for type 1 or 2 load for overseas shipment, PPP-B-621,
having inside dimensions of 18-3/8 by 13-1/4 by 9-7/8 inches length, width, and
depth, respectively. As an alternate, wirebound boxes conforming to type I,
class 2, grade A, MIL-B-46506 may be used. Boxes shall be assembled, closed,
and strapped in accordance with the respective box specification, as appli-
cable. Strapping used shall conform to class A or B, type I or IV, QQ-S-781.
6
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