AATCC Test Method 42-2000 Water Resistance: Impact Penetration Test.
1.1 This test method is applicable to any textile fabric, which may or may not have been given a water-resistant or wa- ter-repellent finish. It measures the resis- tance of fabrics to the penetration of wa- ter by impact, and thus can be used to predict the probable resistance of fabrics to rain penetration. It is especially suit- able for measuring the penetration resis- tance of garment fabrics. 1.2 The results obtained with this test method depend on the water repellency of the fibers and yarns and on the con- struction and finish of the fabric.
2. Principle
2.1 A volume of water is allowed to spray against a taut surface of a test spec- imen backed by a weighed blotter. The blotter is then reweighed to determine water penetration and the specimen is classified accordingly.
3. Terminology
3.1 water resistance, n.—of fabric, the characteristic to resist wetting and penetration by water. (See also water repel- lency.)
4. Safety Precautions NOTE: These safety precautions are for information purposes only. The precautions are ancillary to the testing procedures and are not intended to be all inclusive. It is the user’s responsibility to use safe and proper techniques in handling materials in this test method. Manufacturers MUST be consulted for specific details such as material safety data sheets and other manufacturer’s recommendations. All OSHA standards and rules must also be consulted and followed.
4.1 Good laboratory practices should be followed. Wear safety glasses in all laboratory areas.
5. Apparatus and Materials
5.1 Impact penetration testers
5.1.1 Type I tester (see 11.1, Figs. 1, 3 and 4)
5.1.2 Type II tester (see 11.1, Figs. 2, 3 and 4)
5.2 White AATCC Textile Blotting Pa- per (see 11.2)
5.3 Water, distilled, deionized or re- verse osmosis
5.4 Balance accurate to 0.1 g
6. Test Specimens
6.1 A minimum of three specimens are taken, each 178 × 330 mm, with the warp (machine direction of the fabric) in the long direction. The specimens and the blotting paper should be conditioned in an atmosphere of 65 ± 2% RH and 21 ± 1°C for at least 4 h before testing.AATCC Test Method 42 pdf download.