MIL-PRF-32504
4.4 Methods of Inspection: Weather barrier fabric and Insulating Liner fabric samples, associated fabric
panel construction materials:
4.4.1 Accelerated weathering-xenon lamp: Accelerated weathering procedure (xenon exposure).
AATCC Method 169 except that the following deviations shall apply:
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)
band pass 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 the specimen rack of the apparatus with no wrinkles or
gaps. The test specimen shall be mounted on 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.
Then test specimens for each required test shall be cut and tested appropriately.
NOTE: Monitoring of dry bulb temperature, wet bulb depression, irradiance, and black panel temperature
is recommended through the use of chart recorders.
4.5 Operating requirements verification: Complete each verification in Section 4.6
4.5.1 Physical characteristics: Complete each verification in Section 4.5
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