PTFE waterproof and breathable membrane is a material that many users are more interested in, because just from the name, it is somewhat unclear what the principle is, and this is the charm of science, which cannot allow us to easily understand the mystery,

but today The editor of Phoebe will take you to uncover the mystery of this material.

On the surface, there are obvious pressure points on both sides of the waterproof and breathable membrane. That is because the production process is through hot pressing. Please note that it is not the dot pattern of the non-woven fabric itself, but the obvious overlapping dot pattern. 

To tear off the waterproof and breathable membrane, first of all, the middle polymer layer should be a milky white and soft waterproof and breathable layer. Because it is laminated by heat and pressure, there should be pressure points on this layer of membrane.

The PTFE waterproof and breathable membrane adopts the former. Since the minimum diameter of water droplets is about 20 microns, while the diameter of water vapor molecules is only about 0.0004 microns, there is a huge difference between the two diameters. 

Water vapor can pass through the microporous membrane by the principle of diffusion. Due to the surface tension of liquid water or water droplets, water molecules cannot pass through, which prevents the penetration of water, and makes the Phoebe breathable membrane waterproof.

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