MIL --- PRF --- 51483A(EA)
tion. If any data point fails to comply with the applicable requirement in 3.3.1(a), the Govern-
ment reserves the right to require a failure analysis and/or require supplemental testing.
(b) Verify 3.3.1(b) by supplying filtration efficiency data obtained on M48A1 filters or
other appropriate gas --- particulate filters specified in the contract (see 6.2(f)). The filtration ef-
ficiency data shall consist of filtration efficiency data obtained on first article gas --- particulate
filters prior to production. If any data point fails to comply with the applicable requirement in
3.3.1(b), the Government reserves the right to require a failure analysis and/or require supple-
mental testing.
4.4.2.2 Edgeseal physical properties.
4.4.2.2.1 Preparation of test specimens. Specimens for testing the fused edgeseal material
in 4.4.2.2.3 through 4.4.2.2.7 shall be made in open aluminum molds 6 --- 1/2 inches by 6 --- 1/2 inch-
es by not more than 1/2 --- inch thick, with a cavity size 6 inches by 6 inches and of sufficient depth
to produce a sheet 0.075±0.005 inch in thickness. The mold cavity shall be filled with fully dis-
persed edgeseal material and placed in a mechanical, convection, recirculation type oven at a
temperature of 425±2°F so that the mold is essentially level. The edgeseal material shall be
fused at 400°F as indicated by a thermocouple placed in the center of the sample. (A calibrated
thermocouple shall be used to determine the internal temperature of the material; care should
be exercised to insure that the thermocouple does not bottom on the mold cavity.) Once 400°F is
indicated by the thermocouple, hold specimen in oven for 3(+1 --- 0) minutes, remove the mold
from the oven, and cool it at room temperature for 8.0±1.0 minutes followed by forced air cool-
ing to room temperature within 10.0±1.0 minutes of removal from oven. Conditioning of speci-
mens shall commence within 48 hours of molding the fused sheets. The conditioning shall be in
accordance with the applicable test method.
4.4.2.2.2 Aged test specimens. Test specimens to be aged shall be prepared as in 4.4.2.2.1 and
subjected to an exposure cycle of 24 hours at 175±2°F and 24 hours at --- 40±2°F. The specimens
shall be held at 73.5±2°F and 50±2 percent humidity for a minimum of 48 hours before testing.
4.4.2.2.3 Hardness. Three specimens prepared as specified in 4.4.2.2.1 shall be tested in ac-
cordance with ASTM D2240. Repeat hardness test on aged test specimens (4.4.2.2.2).
4.4.2.2.4 Tensile strength. Six specimens prepared as specified in 4.4.2.2.1 may be tested in
accordance with Method 4111 of FED --- STD --- 601. The specimens may be cut with die number
III of figure 4111. Per Change Notice 7 of FED --- STD --- 601, the preferred test method is the
following: Five specimens shall be tested in accordance with ASTM D412, Method A. Deter-
mine average tensile strength. Repeat tensile strength test on aged test specimens (4.4.2.2.2).
4.4.2.2.5 Tear strength. Three specimens prepared as specified in 4.4.2.2.1 shall be tested in
accordance with ASTM D624 using die C. Determine average Type C tear strength. Repeat tear
strength test on aged test specimens (4.4.2.2.2).
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