MIL-PRF-3135H
4.5.7 Resistance to moisture and temperature changes. Two panels shall be prepared in accordance with 4.4.1,
with the exception that the plates shall be 150 by 50 by 3.18 millimeters (6 by 2 by 0.125 inch). The underlayment
shall be applied to each plate at a thickness of 6.4 millimeters (0.25 inch) and allowed to cure to service per
manufacturer's instructions. Both panels shall then be immersed in a solution of 4 percent sodium chloride in water,
under a pressure of 55 kilopascals (8 pounds per square inch), for 48 hours. Immediately following the immersion
period, the specimens shall be subjected to two complete cycles of alternate exposure to a temperature of -18±3 °C
(0±5 °F) for 24 hours, followed by a temperature of 49±3 °C (120±5) °F for 24 hours. The deck covering underlay
material shall then be visually examined for evidence of cracking or other failure. A portion of the underlayment
shall then be carefully removed from the plate to observe any signs of rusting or corrosion beneath the
underlayment.
4.5.8 Moisture absorption. Three panels of cold rolled steel with dimensions of 50 by 50 by 3.18 millimeters (2
by 2 by 0.125 inch) shall be prepared by submerging the panels in oil and then removing them without cleaning or
wiping the oil from the surface. The underlayment shall be applied to the panels at a thickness of 6.4 millimeters
(0.25 inch) and allowed to cure to service at referee conditions in accordance with manufacturer's instructions;
however, the underlayment shall not adhere to the oiled plates. Each fully cured specimen of underlayment (after
being removed from the steel backing plate) shall then be completely submerged in tap water at room temperature,
then immediately removed. All surfaces shall be lightly wiped with a paper towel to remove excess water from the
surface of the underlayment, and then immediately weighed to the nearest 0.1 gram (0.004 ounce). After this initial
weight has been recorded, the specimens shall be fully immersed again in room temperature tap water for a period of
24 hours. After 24 hours, the specimens shall be removed, lightly wiped with paper towels to remove excess water
from the surface, and again weighed to the nearest 0.1 gram (0.004 ounce). The weight of the sample after initial
dipping in tap water shall be subtracted from the weight of the sample after the 24-hour immersion period, and the
difference recorded. The percent gain in moisture for each sample shall then be calculated by dividing this weight
difference by the weight of the sample after the initial dipping in tap water, and multiplying by 100 percent. The
percent moisture absorption shall then be averaged for all three samples, and the result recorded.
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