MIL-PRF-43906D
the specimens shall be removed from the apparatus and allowed to dry and condition at
Standard Conditions.
NOTE: Monitoring of dry bulb temperature, wet bulb depression, irradiance, and black panel
temperature is recommended through the use of chart recorders.
4.4.6 Adhesion of coating. ASTM-D-751, Adhesion of Coating with 2 inch wide reinforced
coating adhesion specimens, cyanoacrylate (solventless) adhesive, and pulling clamp speed of
5 mm/s. Three specimens shall be tested by adhering face-to face and three specimens shall
be tested by adhering back-to-back.
4.4.7 Blocking. ASTM D-751, Determination of Blocking Resistance of Fabrics Coated with
Rubber or Plastics at Elevated Temperatures, except that only one specimen shall be exposed
at an oven temperature of 180°F +2°F for 30 minutes.
4.4.8 Resistance to leakage test. ASTM-D-751, Hydrostatic Resistance, Procedure B,
(Pressure Application by a Rising Column of Water), Procedure 2 with the hydrostatic head
fixed at 50 centimeters and applied to the test specimen for 10 minutes. The back side of the
finished cloth shall contact the water. The report shall only include "measurement of the
appearance of water drops". Leakage of any specimen shall be considered a test failure.
Leakage is defined as the appearance of water at three or more different places within the 4
1/2 inch diameter test area.
4.4.9 Resistance to diethyltoluamide. The diethyltoluamide for use in this test shall conform
to type II, concentration A of O-I-503. Three drops of the diethyltoluamide solution shall be
placed in the center of a 4 by 8- inch specimen of the finished cloth with the diethyltoluamide
solution contacting the face side. The specimen shall be folded to form a 4 by 4-inch square
with the face sides contacting each other. The folded specimen shall then be placed between
two 6 by 6-inch glass plates and a 4-pound weight placed on the assembly and left at standard
conditions for 16 hours. The specimen shall then be removed from between the glass plates,
scale rated for blocking as shown in ASTM D-751, Determination of Blocking Resistance of
Fabrics Coated with Rubber or Plastics at Elevated Temperatures, except that the specimen
shall not be exposed to elevated temperature, and then immediately examined for
conformance to the requirements in Table I.
4.4.10 Adhesion of seam tape. The test shall be conducted as follows: A heat seal tape, 1
inch (+ 1/16 inch) wide shall be heat sealed to the back side of the finished cloth by activating
the thermoplastic adhesive layer of the heat seal tape using high temperature air and then
immediately plying the tape with the back side of the waterproof cloth (parallel to the warp
direction of the waterproof cloth) obtaining intimate contact between the tape and waterproof
cloth by passing through pressurized rollers. The use of a flat-faced heated platen-type
sealing machine is prohibited. Five specimens shall be prepared; no two specimens shall
contain the same warp yarns. Test specimens shall be cooled and conditioned prior to testing
for adhesion. The adhesion test shall be conducted in accordance with Method 5962 of FED-
STD-191 except that the maximum load of resistance occurring in the 3-inch separation shall
be recorded.
4.4.11 Color matching. The color of the waterproof cloth shall match the standard sample
when viewed under filtered tungsten lamps that approximate artificial daylight and that have a
correlated color temperature of 7500 + 200oK, with illumination of 100 + 20 foot candles,
and shall be a good match to the standard sample under incandescent lamplight at 2300 +
200oK.
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