What is the difference between a waterproof and breathable membrane and a waterproof and sound-permeable membrane?

What is the difference between a waterproof and breathable membrane and a waterproof and sound-permeable membrane?

One of the main differences between the waterproof breathable membrane and the waterproof sound-permeable membrane is that the waterproof breathable membrane focuses on ventilation, while the waterproof and sound-permeable membrane focuses on sound transmission. Waterproof and breathable membranes and waterproof and sound-permeable membranes generally use different materials. Of course, in some specific cases, waterproof and breathable membranes and waterproof and sound-permeable membranes can be realized using expanded polytetrafluoroethylene (ePTFE) Waterproof and breathable, waterproof and sound-permeable, dust-proof and heat-dissipating products.

PTFE waterproof breathable sound-permeable membrane working principle

When the PTFE waterproof and breathable membrane is in the state of water vapor (water vaporization), the water particles are very small, and these water vapor particles can penetrate along the micropores of the waterproof membrane to the capillary (membrane) to the other side (the side that needs to be emitted) , a breathable phenomenon occurs. If the water vapor condenses into water droplets, the particles will become larger, and the surface tension of the water droplets will act in it, and the water molecules will not be able to leave the water droplets smoothly and penetrate back to the original side, that is to say, such One process can prevent the occurrence of water infiltration, that is, it can well isolate water and other liquids from the outside, so that the PTFE waterproof and breathable membrane material really has the function of waterproof and breathable.