MIL-PRF-53068B
TABLE II. Characteristics of coated fabric.
Test paragraph or test
Item
Property
Requirement
method of FED-STD-191
1
Weight (ounces per square
30 min/62 maximum (max) 5041
yard (oz/sq yd))
2
Tearing strength wrap and
25 pounds (lbs) (min)
5134
fill
3
Breaking strength
350 psi (min)
5102
4
Weathering resistance after
80% retention of initial
5804/5102 1/
750 hours exposure at 5%
breaking strength (min)
elongation, warp and fill
5
Puncture resistance
110 lbs (min)
4.5.3.13/5120
6
Low temperature crease
No cracking, peeling or
4.5.3.14
resistance:
delamination
a. Appearance after
unfolding
7
Fungus resistance
No cracking, blistering, or
5762 2/
delamination of coating.
Retention of breaking
strength 70% (min).
8
Blocking
Specimens to separate
4.5.3.15
within 5 seconds
9
Coating adhesion (initial)
15 psi (min)
4.5.3.16 and 4.5.3.16.1
10
Coating adhesion after
immersion in distilled
water at 160±2 °F for the
following durations:
14 days
12 psi
4.5.3.16.1
42 days
10 psi
4.5.3.16.1
1/ Specimens shall have exterior coating facing carbon arc. Alternate corex D filters shall be
removed.
2/ Except that the specimens shall be prepared in accordance with method 5102 and the number
of specimens shall be reduced from 40 to 5 warp and 5 fill. Leaching of specimens is
unnecessary. The specimens shall be exposed to the soil for eight weeks.
3.3.1 Seams. All tank seams including end closures, handle patches, chafing patches and
fabric flanges of fittings, shall conform to the requirements of table III. Seams between adjacent
panels of coated fabric shall be constructed as to prevent wicking of water through the fabric.
7
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