1. Purpose and scope
1.1 This test method is used to determine the resistance of fabrics to water penetration under hydrostatic pressure. It is applicable to all types of fabrics, including fabrics with waterproof finishing and water-repellent finishing.
1.2 Water resistance depends on the resistance of fibers and yarns to water, as well as the fabric structure.
1.3 The results measured by this method are different from the results measured by the AATCC rain or water spray method.
2. Principle: Apply water pressure increasing at a constant rate on one side of the sample until three water seepages appear on the other side of the sample. The water pressure can be applied from the top or bottom of the sample
3. Terminology:
Hydrostatic Pressure: The distribution of pressure over an exposed area by water.
Water resistance: Resistance to moisture and water penetration.
Waterproofness: In textiles, refers to the moisture resistance of fibers, yarns or fabrics.
4.Instruments and materials
4.1 Hydrostatic pressure tester: Option 1, hydrostatic pressure tester; Option 2, hydrostatic head tester.
4.2 Distilled or deionized water.
5. Test sample
5.1 Take at least 3 representative test samples on the fabric along the diagonal direction of the width. The size of each sample is at least
200x200mm.
5.2 Touch the sample as little as possible to avoid folding and contaminating the part being tested.
5.3 Before testing, place the sample flat in an environment of 21±2℃ and relative humidity of 65±2% for at least 4 hours.
5.4 The surface of the fabric that comes into contact with water must be specified, because the results of contact between the front and back sides will be different. Mark the front and back sides of each sample at the corners.
6. Test procedure:
6.1 Check whether the temperature of the water in contact with the test sample is 21±2℃ or above.
6.2 Dry the surface of the fixture.
6.3 Place the surface of the sample to be tested facing the water and clamp the sample.
6.4 Operation
6.4.1 Option 1 – Hydrostatic pressure tester, start the engine, press and hold the control lever to increase the overflow rate to 10mm/s, and close the vent when the water flows out.
6.4.2 Option 2 – Hydrostatic head tester, select gradient 60mbar/min and press the start button.
6.5 Ignore the water droplets within 3mm adjacent to the edge of the clamp. When the water droplets seep out at three different locations, record the hydrostatic pressure at this time.
7. Calculation: Calculate the average hydrostatic pressure of each sample.
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