Determination
of water repellency of fabric against external wetting is
carried out with the help of the spray tester. The Spray Test
method is used for determining the resistance of any fabric,
which may or may not have been given a water resistant/repellant
finishing surfacing wetting by water. In this test, a specified
volume of distilled water is sprayed on a Test specimen, which
has been mounted on a ring and placed at an angle of 450,
so that the center of the specimen is 150mm below the spray
nozzle. The Spray rating is determined by comparing the appearance
of the specimen with the standard Rating Chart.
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