A-A-54339
Surface resistivity or static decay test. Testing shall be conducted as described in NFPA-99 (National Fire Codes). A copy of which is available from the National Fire Protection Association, 470 Atlantic Avenue, Boston, MA 02110.
Water repellency test.
Principle of method: The fabric to be tested is used to seal an inverted vented mason jar containing a saline solution and the penetration of the solution through the fabric noted.
Apparatus:
a. 2-11/16 inch diameter circular cutting die.
b. Mason jars (1 qt.) with holes drilled in the bottom and metal rings with openings 2-3/16 inch in diameter and fitted with gaskets. Gasket size is outside diameter 2-3/4 inch, inside diameter 2-3/16 inch. The gaskets are to be cut from a coated fabric No. ES-555-B.
c. One glass plate.
d. One mirror.
e. A tensor high intensity lamp to place between the glass and mirror to shine on the sample during the test.
Reagents: 0.9 percent saline solution.
Sample preparation: Die cut 5 samples randomly across the width of the fabric or cut 5 – 5 inch squares randomly across the width of the fabric.
Procedure:
a. Hold a finger on the vent hole, pour enough saline solution into a jar to give a 4-1/2 inch head (approximately 600 mls.)
b. Place the test sample on the mouth of the jar and screw the metal ring and the gasket in place with sufficient torque to prevent leakage.
c. Invert the jar onto the glass plate which is mounted six to eight inches above the mirror.
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