MIL-PRF-22019E
(see 4.6.2.3.1) shall be tested as specified in 4.6.2.2.2.
4.6.3 Seam and material water resistance.
4.6.3.1 Preparation of test solution. Add one part by weight Aerosol OT (or equivalent),
one part by weight Erythrosin B (or equivalent), and 98 parts by weight distilled water. Allow
the mixture to stand with periodic shaking for 4 hours. Dilute one volume of the mixture with
four volumes of distilled water.
4.6.3.2 Procedure. Five pouches having inside dimensions of 5 by 6 inches, shall be
completely filled with shredded white absorbent tissue and sealed. No strain shall be placed on
the material or seams when filling. The sealed pouches shall then be immersed in the test
solution for 5 minutes so that the seals are one inch below the solution surface. At the end of 5
minutes the pouches shall be removed from the solution and rinsed with tap water. The tissue
shall then be examined for evidence of staining. Absence of staining shall indicate that sample
pouches resisted penetration of water.
4.6.4 Compatibility with copper.
4.6.4.1 Preparation of test assembly panel. Three panels of cold rolled, hard temper copper
conforming to ASTM-B152/B152M and measuring 1/16 by ½ by 3 inches shall be polished to
remove pits and irregularities from all surfaces. The panels shall be polished with 240 grit
aluminum oxide. The use of "wet or dry" paper is prohibited. Iron oxide abrasives shall not be
used. The final abrasion shall be in a direction parallel to the length of the panel. Each panel
shall be bent into a "U" shape having a radius of ¼-inch and a distance of ½-inch between side
walls at the ends. The U-shaped panel shall be wiped clean using laboratory tissue dampened
with methanol. A sample of barrier material measuring ¾ by 3½ inches shall be tightly wrapped
around each "U" shaped panel with the sealable side in contact with the copper, so that the
material is perpendicular to the longitudinal axis and at the base of the open section of the "U".
The barrier material shall be secured with nylon thread.
4.6.4.2 Procedure. Fifty ml of a solution of glycerine and distilled water having a specific
gravity of 1.103 at 75 ± 3 °F shall be poured into a wide-mouth glass jar of one pint capacity to
provide a relative humidity of 85 ± 3 percent at 150 ± 2 °F. A glass vessel for use as a stage
shall be inverted and placed inside the jar. The three wrapped panels shall be placed around the
perimeter of the stage with both legs of the inverted "U" resting on the stage in the test jar
avoiding contact with glycerine solution. The test jar shall be sealed with a screw cap using an
aluminum foil gasket and placed in a circulating air oven at 150 ± 2 °F for 7 days. The test jar
shall then be removed from the oven, allowed to cool, and the copper panels removed and
unwrapped. The "U" shaped specimen shall be examined on the inside surface of the "U" for
evidence of corrosive effects from the vapor in accordance with ASTM-D130.
4.6.5 Long term protection.
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