MIL-DTL-82646B (OS)
a. The test apparatus of Method 403.1 of MIL-STD-286 shall be used.
b. The composite specimen shall consist of 1.0 gram (g) of dried plastic and 1.0 g of dried
chemical.
c. The individual (control) specimens shall consist of 2.0 g of dried plastic and 2.0 g of dried
chemical, respectively.
The plastic shall be considered compatible if the measured compatibility is not greater than 5 cubic
centimeters (cm3) where:
Compatibility =
E (F + G)
2
Where:
E = cm3 of gas evolved by the plastic-chemical mixture
F = cm3 of gas evolved, by the plastic alone
G = cm3 of gas evolved by the chemical alone
4.6.3 Solvent compatibility. Film samples shall be immersed in the solvents (a separate specimen for each
solvent) specified in 3.4.2 for 7 days at 24º ± 3ºC (75º ± 5 ºF). Visual examination after treatment shall
reveal no adverse defects. The treated film shall be tested in accordance with 4.6.6 to determine
compliance with 3.4.2.
4.6.4 Permeability. The water vapor permeability shall be measured in accordance with ASTM E 96 or an
equivalent test approved by the procuring activity. The test chamber or room shall be maintained at 35º ±
1°C (95º ± 2 ºF) and 95 ± 3 percent relative humidity and shall be provided with a means of maintaining a
current of air flowing at a rate of 500 ± 25 feet per minute (2.54 ± 0.13 meters per second).
4.6.5 Electrical resistivity. The electrical resistivity shall be determined in accordance with the following
test procedure using the test equipment shown in Figure 1 and 2. The film specimens shall be a minimum
of 25 cm long by 2.54 + 0.0. - 0.025 cm wide.
Test procedure:
a. Place the electrode assembly on top of the specimen with the polished electrode edges resting
on the specimen, and the electrodes perpendicular to the long sides of the specimen.
b. Place a 5-pound weight on top of the electrode-insulator assembly.
c. Measure resistance at random locations along the film specimen.
d. Record a minimum of five determinations, their average, and the standard deviation for each
specimen.
4.6.6 Film tensile strength, breaking strength and elongation. The film shall be tested as received in
accordance with ASTM D 882 with the following exceptions:
a. The width of each specimen shall be I inch (2.54 cm)
b. The initial jaw separation shall be 2 inches (5.08 cm)
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