AATCC 70:2015 pdf download.Water Repellency: Tumble Jar Dynamic Absorption 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 wetting by water. It is particularly suitable for measuring the water-repellent efficacy of finishes ap- plied to fabrics, because it subjects the treated fabrics to dynamic conditions similar to those often encountered during actual use. It is not intended for use in predicting the probable rain penetration resistance of fabrics, since it measures absorption of water into, but not through, the fabric.
1.2 The results obtained with this test method depend primarily on the resis- tance to wetting or water repellency of the fibers and yarns in the fabric, and not upon the construction of the fabric.
2. Principle
2.1 Preweighed specimens are tumbled in water for a fixed period of time and are reweighed after the excess water has been removed from them. The percentage in- crease in mass is taken as a measure of the absorption or resistance to internal wetting.
6.1 Stock solutions of the agents to be tested are normally prepared to contain 50.0 g of agent per liter unless the solu- bility is so poor that less must be em- ployed. The wetting agent is first thor- oughly dissolved in about a quarter of the necessary distilled water at a temperature above 80°C and is then diluted to the final volume with cold distilled water. Aliquot portionsof5, 7, 10, 15, 25, 35, 50, 75 and 100 mL of the 5% stock solution taken with delivery bulb pipettes and diluted with suitable water (see 10.4) to 1000 mL correspond, respectively, to concentra- tions of0.25, 0.35, 0.50, 0.75, 1.25, 1.75, 2.50, 3.75 and 5.00 g of wetting agent per liter. This range of concentrations is suffi- cient for the study of any commercial product.AATCC 70 pdf download.