What is the waterproof and breathable principle of ePTFE Membrane?

The waterproof and breathable principle of ePTFE Membrane is based on its special microporous structure and physical properties.
ePTFE Membrane is a continuous fiber formed by stretching polytetrafluoroethylene (PTFE), and then ablated to form a microporous structure. The pore size of these micropores is very small, usually less than 10 microns, which can effectively block the passage of water molecules, thereby achieving a waterproof effect.
At the same time, the microporous structure of ePTFE Membrane allows air molecules to pass through, achieving the function of breathability. This is because the diameter of air molecules is much larger than that of water molecules and can pass through the micropores smoothly.
The formation of this microporous structure ensures both waterproof performance and breathability, making ePTFE Membrane widely used in new energy vehicles, construction, clothing and other fields.