Principle of Waterproof Breathable Membrane

The waterproof breathable membrane in the construction area is mainly used in steel structure and wooden structure. So,do you know the

principle of waterproof breathable membrane?The waterproof breathable membrane mainly consists of threelayers: PP nonwoven fabric,

Polyolefin microporous membrane,PP nonwoven fabric.The effect of the nonwoven fabric is mainlyto strengthen the tension and hydrostatic

pressure and to protect the middle layer (breathable membrane). In fact,thebreathablility depends on the breathable film.


Principle of waterproof and breathable membrane: in the state of water vapor, the water particles are very small. According to the principle

of capillary movement, it can permeate the capillary tube to the other side, which can cause the phenomenonof vapor transmission.When

the water vapor condense into water droplets, particles become large, due to the effect of water surface tension (pull against each other 

between water molecules),the water molecules cannot escape from the water to theother side of the membrane.In this way,the membrane

is given with the function of waterproofness.

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