A-A-54421
b. Expanded network-like polypropylene film.
c. Nonwoven nylon fabric.
The adhesive shall be pressure sensitive, shall be on one side of the skin closures and shall be continuously visible. The adhesive shall be a pure, single component acrylate or acrylic copolymer and shall be hypo-reactive.
The facing material (card) shall be smooth and shall be capable of protecting the adhesive and shall resist breaking, cracking or tearing when the skin closures are removed. The facing material shall have a minimum thickness of four mils and shall be chemically inert o the adhesive. The facing material shall be in the form of rectangular cards. Each rectangular card shall be clean cut and each card shall be perforated at least 1/4 inch from each end to permit easy removal of the skin closures by exposing the ends of all skin closures on each card. There shall be visible spaces between the skin closures on each card.
The skin closures shall comply with the following requirements:
|
PROPERTY |
MINIMUM |
MAXIMUM |
TEST METHOD |
|
Adhesion to steel (ounces per inch of width) or as an alternate to steel. |
6 |
70 |
ASTM-D-1000 1/ |
|
Adhesion to aluminum (ounces per inch of width) |
32 |
96 |
ASTM-D-1000 1/ |
|
Porosity (seconds per 100 cc of air) |
-- |
500 |
ASTM- D-726 Method A |
|
Breaking strength, dry (pounds per inch of width) |
10 |
50 |
ASTM-D-882 Method A 3/ or Method B 4/ |
|
Thickness (inch) |
0.0030 |
-- |
Fed Std No 147 Method 36 |
|
Ultimate elongation (percent) |
5 |
100 |
ASTM-D-882 Method A 3/ or Method B 4/ |
1/ Multiple skin closures, parallel to each other, shall be used to make up the one inch width.
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