AATCC 35:2000 pdf download.Water Resistance: Rain Test
1.1 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 intensi- ties (see 11.1) of water impact to give a complete overall picture of the penetra-tion resistance of a single fabric or a combination of fabrics.
1.2 The results obtained with this test method depend on O water repellency of the fibers and yarns, and on the con- struction of the fabric.
2. Principle
2.1 A test specimen, backed by a weighed blotter, is sprayed with water for 5 min under controlled conditions. The blotter is then reweighed to determine the amount of water which has leaked through the specimen during the test.
4. Safety Precautions NOTE: These safety precautions are information purposes only. The pre- cautions are ancillary to the testing proce- dures and are not intended to be all inclu- sive. It is the user's responsibility to use safe and proper techniques in handling materials in this test methodg: Manufac- turers MUST be consulted specific details such as material safety data sheets and other manufacturer 's recommenda- tions. 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.
7.1 The test specimen (see 11.5), backed bya 15.2 x 15.2 cm standard pa- per blotter weighed to the nearest0.1 g is clamped in the specimen holder and the assembly is mounted in a vertical rigid support frame. The specimen assembly is positioned into the central portion of the spray at a distance of 30.5 cm from the face of the spray nozzle (see 11.6). A hor- izontal water spray at27士1°C (see 11.2) is directed against the specimen and is al- lowed to continue for a period of 5 min. At the end of the spray period the blotter is carefully removed and quickly re- weighed to the nearest 0.1 g.AATCC 35 pdf download.