MIL-PRF-43473G
be removed from between the glass plates, scale rated for blocking as shown in ASTM D-751,
Determination of Blocking Resistance of Fabrics Face 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.
4.4.6 Abrasion resistance . ASTM-D-3886 except that a solid rubber diaphragm 0.030 +
0.010 inch thick with a nonmetallic contact shall be used. The abradant shall be the face side
of the waterproof cloth. The face side of the waterproof cloth specimen shall be abraded 1000
multidirectional cycles. The specimen shall then be tested for hydrostatic resistance in
accordance with 4.4.1 with the abraded portion of the specimen centered in the hydrostatic
test area.
4.4.7 Stiffness
4.4.7.1 TAPPI Method T-451, Preferred Procedure (1) except that five test specimens with
the long dimension parallel to the warp direction of the finished cloth shall be tested and that
the standard textile test conditions as specified in ASTM D-1776 shall be used.
4.4.7.2 The stiffness test shall be conducted as specified in 4.4.7.1 except that the apparatus
and test specimens shall be subjected to a temperature of 0°F + 2°F for a period of 4 hours
and the test shall be performed in a still atmosphere at that temperature.
4.4.8 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 IB. 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.
f. The control set points shall be as follows:
Dark cycle
Light cycle
Black panel
38°C
77°C
Conditioning water
40°C
53°C
Wet bulb depression 1/
0°C
10°C
1/ As a guide only; adjust to achieve required relative humidity (see e. above).
g. The test specimens shall fit smoothly on the specimen rack of the apparatus with no
wrinkles or gaps. The test specimen shall be mounted to the outside of the rack with the use
of appropriate stainless steel spring clips. After the required exposure period, the specimens
shall be removed from the apparatus and allowed to dry and condition at Standard Conditions.
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