The water pressure resistance of waterproof and breathable membrane refers to the pressure which can withstand when liquid intrusion occurs. The water pressure resistance refers to hydrostatic pressure (Water Proofness abbreviated as: WP), which the unit shows as Kpa. Water proofness is often used to test the waterproof performance of waterproof and breathable membranes. Different application scenarios have different protection level requirements, so relatively wide water pressure resistance range.
Generally speaking, the common test standards of water proofness of waterproof breathable membrane include American standard AATCC 127; Japanese standard JIS L 1092B; European standard: IS0 811; Chinese standard GB/T 12704.
The breathability performance of waterproof breathable will be decreased if too high water proofness, which affecting the air pressure balance. Therefore, it is important to consider multiple factors such as water proofness, breathability and exhaust pressure relief when choose the waterproof breathable membrane, to ensure the best quality and the performance.
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