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Page Title:
Package leakage and heat seal test. |
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|  MIL-M-51113D(EA)
4.4.4 Tests.
4.4.4.1 Outlet valve leakage. Outlet valve leakage shall be determined in
accordance with the M4Al Outlet Valve Leakage Indicator (136-45-202-14).
4.4.4.2 Exhalation resistance. Exhalation resistance of the mask shall be
determined with the Q213 Inhalation and Exhalation Resistance Indicator (136-
44-20-1 ) .
4.4*4.3 Microphone and plug assembly. The microphone and plug assembly
shall be connected to a Microphone Tester, Q12A1, Drawing 136-15-220, or to a
Microphone Tester, Drawing 136-30-114 (see 6.5). The microphone shall be held
against the tester sound source and the tester sound source volume shall be
increased until the tester ammeter/voltmeter needle moves. Any movement in
excess of normal background reading shall indicate an acceptable assembly; no
movement shall indicate a rejected assembly.
4.4.4.4 Mask assembly leakage. Overall leakage of the mask after assembly
shall be determined in accordance with the M14 Protective Mask Leakage Tester
( 136-42-750-1).
4.4.4.5 Package leakage and heat seal test. Leakage and heat seal charac-
teristics of the sealed water-vaporproof bag containing the mask assembly shall
be determined by subjecting the samples to the vacuum chamber and heat seal
test of MIL-P-116.
4.4.5 Acceptance/rejection criteria. The acceptance number for the pack
leakage tests shall be zero, and the rejection number one.
PACKAGING
5.
5.1 Unit p acking, level A. No preservative compounds shall be applied to
any portion of the mask or its components. Each mask shall be fitted with a
faceform (Drawing 5-22-57 or 5-22-58, as applicable to mask size) as shown on
Drawing 5-1-296. Prior to insertion of the faceform into the mask, two sheets
of lens tissue paper, 5 by 7 inches, conforming to NNN-P-40, shall be placed
between the mask lens and the faceform in such a manner to prevent physical con-
tact between the lens and faceform. After insertion of the faceform into the
mask, the mask lens shall be covered with paper, white, newsprint, 32 lb base.
The paper shall be placed over the outside surfaces of the lens and shall be
securely attached to the facepiece by taping to prevent movement, with three
pieces of 1-1/2 inches long by 3/4 inches wide , pressure-sensitive adhesive
tape. A larger size paper taped to the faceform is acceptable. The paper
shall be taped to the mask facepiece, one on each side of the chin portion and
one over the top portion of the facepiece. The tape shall be permitted to con-
tact with the interior robber surfaces of the faceblank. The head harness
assembly shall be tucked into the cavity of the faceform. The mask assembly
shall then be placed inside the carrier~ The carrier straps shall be tucked
inside the carrier in such a manner so that the strap hardware shall not come
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