MIL-PRF-43473G
TABLE IV. End item tests
Characteristic
Test Method *
Pattern execution
4.4.13
Toxicity
4.4.14
Mildew resistance
4.4.15
1/ The face side of the cloth shall be exposed to the light source. The exposure period in the
weatherometer shall be 100 hours. At the end of the exposure period, the specimens shall
be visually examined to determine if the coating has become stiff and brittle or soft and
tacky, or if there is any evidence of cracking or crazing and then tested for hydrostatic
resistance.
2/ Except that the specimen shall be stretched at 20 pounds.
3/ Except that all weighings shall be made to the nearest 0.01 gram.
* Paragraph numbers alone indicate the paragraph numbers in section 4 of this document.
4.4 Methods of inspection.
4.4.1 Hydrostatic resistance. ASTM D-751, Hydrostatic Resistance Procedure A (Pressure
Application by Mullen Type Hydrostatic Tester) Procedure 1. If leakage occurs under 10 psi
on any specimen, that reading shall be discarded and another specimen shall be tested. If
leakage occurs under 10 psi on more than one of the five specimens, all readings shall be
valid. The water pressure shall be applied only to the back side of the face cloth.
4.4.2 Resistance to high humidity. Three 4 by 4-inch specimens shall be laid flat, face side
up, on a supporting plate and the assembly placed in a desiccator containing water in the
lower portion. The water level shall be approximately 1 inch below the specimens. The lid of
the desiccator shall be put in place and the desiccator placed in a circulating air oven having a
temperature of 180°F + 2°F for a period of 14 days. At the end of the aging period, each
specimen shall be removed from the desiccator, visually examined for colorfastness and for
resistance to high humidity and then tested immediately in accordance with 4.4.1.
4.4.3 Water wicking test. One 2 inch by 7 inch sample of waterproof cloth with the long
dimension in the filling direction shall be the test specimen. One end of the specimen shall be
weighted (10 to 20 grams) across the full width of the specimen and immersed to a depth of 2
inches in distilled water at room temperature for 5 minutes. When withdrawn from the water
the height of the wetted area above the original 2-inch water line shall be immediately
measured to the nearest 1/32 inch. Three determinations shall be made per sample unit.
4.4.4 Resistance to leakage test. 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 10 minutes. The back side of the
finished cloth shall contact the water. The report shall only include "measurement of the
appearance of water drops". Leakage of any specimen shall be considered a test failure.
4.4.5 Resistance to diethyltoluamide. The diethyltoluamide reagent for use in this test is a
75% diethyltoluamide and 25% ethanol solution (see 6.5). Three drops of the
diethyltoluamide solution shall be placed in the center of a 4 by 8- inch specimen of the
finished cloth with the diethyltoluamide solution contacting the face side. The specimen shall
be folded to form a 4 by 4-inch square with the face sides contacting each other. The folded
specimen shall then be placed between two 6 by 6-inch glass plates and a 4-pound weight
placed on the assembly and left at standard conditions for 16 hours. The specimen shall then
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