MIL-PRF-43906D
Tearing strength
ASTM D 1424
Hydrostatic Resistance
Initial
4.4.1
After accelerated weathering
5804 1/ or 4.4.5 and 4.4.1
After abrasion
4.4.2 & 4.4.1
After strength of coating
5972 2/ & 4.4.1
After high humidity
4.4.3 and 4.4.1
TABLE IV. End item tests
Characteristic
Test method
Colorfastness:
To accelerated weathering
58041/ or 4.4.5
To high humidity
4.4.3
Stiffness, warp only:
At 70 + 2°F:
4.4.4.1
At 0 + 2°F:
4.4.4.2
Adhesion of coating
4.4.6
Blocking
4.4.7
Resistance
To leakage
4.4.8
To diethyltoluamide
4.4.9
To weathering
5804 1/ 4/ or 4.4.5 4/
To high humidity
4.4.3 4/
Adhesion of seam tape
4.4.10
Color
4.4.11
Spectral reflectance:
Type I and Type II
4.4.12
Pattern execution
4.4.13
Toxicity
4.4.14
Mildew resistance
4.4.15
1/ The face side of the waterproof cloth shall be exposed to the light source. The exposure
period in the weatherometer shall be 100 hours. 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.
2/ Except that the specimen shall be stretched at 20 pounds.
3/ "Appreciable change" means a change in color that is immediately noticeable on
comparison of the test specimen with the original unexposed sample. If closer inspection
or a change of angle of light is required to make apparent a slight change of color, the
change is not considered appreciable.
4/ At the end of the exposure period, each specimen shall be visually examined to determine
if the waterproof cloth has become stiff and brittle or soft and tacky, or if there is evidence
of cracking or crazing.
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 with water pressure applied to
the face side of the waterproof cloth.
4.4.2 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
8
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