MIL-PRF-44103D
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 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.
4.4.3 Hydrostatic resistance (low pressure). ASTM D-751, Hydrostatic Resistance Procedure
B (Pressure Application by a Rising Column of Water, Procedure 1 with water pressure
applied to the face side of the cloth.
4.4.4 Hydrostatic resistance (high pressure). ASTM D-751, Hydrostatic Resistance Procedure
A (Pressure Application by Mullen Type Hydrostatic Tester Procedure 1 with water pressure
applied to the face side of the cloth.
4.4.5 Abrasion resistance test. ASTM-D-3886. The abradant shall be the face side of the
cloth. Each specimen shall be abraded for 1,000 multidirectional cycles. After abrading, the
specimens shall be evaluated for color change in accordance with AATCC Method 119, using
the Gray Scale for Color Change. The class rating shall be averaged and then rounded to the
nearest 0.5.
4.4.6 Initial stiffness test (classes 1 and 2). ASTM-D-747 except that eight specimens, four
with the long dimension in the warp direction and four in the filling direction shall be cut
from the sample unit and pressed between two glass plates having dimensions of
approximately 8 inches by 8 inches by 1/8 inch. A 20-pound weight shall be placed on the
top plate for 4 hours at Standard Conditions prior to determining the stiffness. The load scale
reading shall be taken only at a 20-degree angular deflection for each specimen.
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