MIL-PRF-44423A
1/ Except that exposure temperature shall be -40 + 5oF and exposure time shall be a minimum
of 2 hours. The face side of the cloth shall be to the outside of the folds.
4.4 Methods of inspection.
4.4.1 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.
4.4.2 Hydrostatic resistance. 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 3 minutes. The face side of the cloth shall
contact the water. The report shall only include the "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.
4.4.3 Flexing. Two 8-inch by 12-inch specimens shall be cut with the 12-inch dimension
parallel to the warp direction. Each specimen shall be flexed as specified in ASTM F-392,
Condition D for 100 cycles with the face side of the cloth mounted to the inside of the
cylinder except that the determination of pinhole count shall not be performed, the specimen
shall not be aged, and the short edges shall not be heat sealed or otherwise joined. After
flexing, the specimen shall be cut in half to form two, 6-inch by 8-inch pieces. Three of the
four pieces shall be tested for water permeability in accordance with 4.4.2.
4.4.4 Accelerated weathering. AATCC Method 169 except that the deviations shown below
shall apply. At the end of the accelerated weathering exposure period, each specimen shall
be visually examined for colorfastness and for resistance to accelerated weathering and then
tested for hydrostatic resistance.
Deviations to AATCC Method 169:
a. The test apparatus shall be either test chamber Type 1A or 1B. Type 1B shall be
equipped with a three-tiered inclined specimen rack. The apparatus shall be equipped with an
automatic light monitor and shall be capable of automatically controlling irradiance,
temperature, and humidity. The apparatus shall be maintained in accordance with the
manufacturer's recommendations.
b. The weathering test cycle shall be 40 minutes of light, 20 minutes of light with water
spray on the fabric face, 60 minutes of light, 60 minutes of darkness. The test cycle shall be
repeated until the total energy exposure is equal to 100 kilojoules per square meter.
c. The irradiance level shall be 0.55 + 0.01 watt/square meter/nanometer (w/m2/nm)
bandpass at 340 nanometers.
d. The glass filter combination shall be a quartz inner filter and a borosilicate Type "S"
outer filter.
e. The relative humidity shall be 50 + 5 percent during the light cycle and not lower than
95 percent during the dark cycle.
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