Hydrostatic test | ISO 811-2018 | Textile testng #testextv #rahatsarfraz #rahbartrainingservices

Rahat Sarfraz (myself) found this platform to train textilians specially New comers for success in their field. I saw many hurdles in my textile life for knowledge gaining. So enjoy learning and if anyone found any mistakes in my videos about testing please let me know for my correction. My channel link.    / @testextv   Test Details are below Scope This document specifies a hydrostatic pressure method for determining the resistance of fabrics to penetration by water. The method is applicable to all types of fabrics which are intended to be water resistant whether or not they have been given a water-resistant or water-repellent finish. Principle The hydrostatic head supported by a fabric is a measure of the opposition to the passage of water through the fabric. A specimen is subjected to a steadily increasing pressure of water on one side of the fabric, under standard conditions, until penetration occurs in three places. The pressure at which the water penetrates the fabric at the third place is noted. The water pressure may be applied from below or from above the test specimen. The chosen alternative shall be stated in the test report. The result is immediately relevant to the behavior of fabric articles which are subjected to water pressure for short or moderate periods of time. Mechanism for measuring the increase in water pressure. The rate of increase of water pressure shall be 10 cm H2O/min ± 0,5 cm H2O/min or 60 cm H2O/min ± 3 cm H2O/min (9,8 mbar H2O/min ± 0,5 mbar H2O/min or 58,8 mbar H2O/min ± 2,9 mbar H2O/min). Results obtained by different rates may not be the same. The chosen alternative rate shall be stated in the test report. Test specimen After receipt, handle the fabric as little as possible, avoid folding it sharply and do not treat it in any way (e.g. by ironing it) other than by conditioning. Take at least five test specimens from different places in the fabric so that they do not contain the same yarns and represent the material as fully as possible. The fabric may be tested without cutting specimens. Areas with deep creases or fold marks shall not be tested.