In the state of water vapor, water particles are very small, and according to the principle of capillarity movement, water can smoothly penetrate into the capillary to the other side, thus the phenomenon of steam penetration occurs.

When the water vapor condenses into water droplets, the particles become larger. Due to the effect of the surface tension of water droplets (water molecules "pull against each other"), the water molecules can not be smoothly separated from the water droplets to penetrate to the other side, that is, to prevent the penetration of water, so that the permeable membrane has the waterproof function.

Waterproof breathable film is mainly composed of three layers: PP spunbonded non-woven fabric, PE polymer breathable film, PP spunbonded non-woven fabric.

Routine data of waterproof breathable membrane:

1. gram weight :70-220g, conventional gram weight in: 80/100/120/140/160g.

2. The conventional width is 1.5 meters.

3. Rewinding meter: 50 meters/rewinding is normal, or rewinding can be done according to the order requirements.

4. The product can be used for more than 10 years.