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AATCC 35 2013 Edition, January 1, 2013
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Water Resistance: Rain Test
Additional Comments: SAME AS ISO 22958
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Purpose and Scope 

This test method is applicable to any textile fabric, which may or may not have been given a water-resistant or water-repellent finish. It measures the resistance to the penetration of water by impact, and thus can be used to predict the probable rain penetration resistance of fabrics. It is especially suitable for measuring the penetration resistance of garment fabrics. With the instrument, tests may be made at different intensities (see 11.1) of water impact to give a complete overall picture of the penetration resistance of a single fabric or a combination of fabrics. 

The results obtained with this test method depend on the water repellency of the fibers and yarns, and on the construction of the fabric.