The Water Pressure Resistance Of Waterproof Breathable Membrane

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The water pressure resistance of a waterproof breathable membrane is a key factor for waterproof performance evaluating, by simulating a water pressure environment to test the water penetration resistance , which is often used to test the waterproof performance of waterproof breathable membranes. Commonly, the water pressure resistance is refer to the hydrostatic pressure resistance.

 

There are some water pressure resistance testing standards include American standard AATCC127; Japanese standard JIS L 1092B; European standard: IS0 811; Chinese standard GB/T 12704.

 

POLYSAN adopts millimeters of water column (mmH₂O) of kilopascals(kPa) to express the water pressure resistance.
   1 kPa ≈ 102 mmH₂O

   1 bar ≈ 10,000 mmH₂O

1. 1000-2000mmH₂O (10~20kPa) indicate the membrane material achieves basic waterproof function and prevents tiny water drops or light rain from intruding, but cannot withstand large amounts of liquid.

 

2. 3000-4000mmH₂O (30~40kPa) indicate the membrane material prevents a moderate amount of splashing water and protects the inside of the device from water intrusion, but short time of the immersion in water.

 

3. 5000-10000mmH₂O (50~100kPa) indicate the membrane material withstands long-term underwater immersion.

 

The breathability performance may decrease If higher water pressure resistance, which is affected the air pressure balance time of the equipment. POLYSAN is a professional waterproof and breathable membrane factory in China for TPU waterproof breathable membrane, and TPEE waterproof breathable membrane.