Hydrostatic pressure (Water Proofness abbreviated as: WP): The outdoor fabric industry is accustomed to calling it water pressure resistance. The unit is expressed in mmh2o. It refers to the strength of water pressure per unit area. Under standard laboratory conditions, the fabric withstands the pressure of distilled water spraying upward. And record the maximum value of water pressure, such as water pressure resistance of 5000mmh2o, that is, the unit area can withstand 5m of pressure without leakage. </p
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Commonly used test standards: American standard AATCC 127; Japanese standard JIS L 1092B; European standard: IS0 811; water pressure resistance test is divided into two methods: pre-wash and post-wash tests: </p
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(1) Pre-wash test: Domestic outdoor brands generally test the water pressure resistance value before washing, but do not test the value after washing. If the water pressure resistance value of coated fabrics drops greatly after being washed several times, it may drop by about 1000-3000 mmh2o; </p
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(2) Post-wash test: Like THE NORTH FACE, there is even a method of testing the water pressure resistance after being washed 5-20 times. Due to the test after multiple washings, the water pressure resistance value drops greatly. For example, the water pressure resistance of coated fabrics requires 5 If it reaches 5000mmh2o after washing with water, it must be at least 7-8000mmh2o before washing; of course, this requirement will lead to higher costs.
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