Waterproof breathable membrane breathability performance testing

At this stage, with the rapid development and application of electronic products, wearable electronic products have also spread widely among the public. Their compact size, exquisite appearance design and practical performance in daily life make users put it down. However, in the face of complex environmental changes in life, these wearable electronic products must also have better environmental adaptability.

As electronic products inevitably emit heat during use, the thermal expansion of the air inside the product will cause damage to precision electronic components. Therefore, the expanded air needs to be channeled in time, and most of these electronic products have external speakers and The original barometer for detecting ambient air pressure strengthens the need for gas exchange between the inner cavity of this product and the external environment. However, the ubiquitous water source in life has become a killer of electronic products. In order to meet the needs of products for water protection and gas exchange, waterproof and breathable membrane products have emerged.

This kind of waterproof and breathable membrane product is mostly made of expanded PTFE material. It has nano-level tiny pores that can make the material breathable, and these tiny breathable pores can prevent the infiltration and penetration of water droplets, thus making the electronics more efficient. It is widely used as a water-blocking and breathable material in product design. However, this kind of material cannot fully guarantee the consistency of the material's micropores during the stretching process, which leads to local differences in air permeability of the material. Moreover, because of the small size of wearable electronic products, the use of waterproof and breathable membranes The area will also become smaller, and the difference in local air permeability of the material will be infinitely magnified. Excessive air permeability in parts of the material may be caused by the large micropore diameter. Larger micropore diameters will lead to a decrease in waterproofing capabilities; while local air permeability that is too small will cause the inner cavity gas of the electronic product to be ineffective. The gas exchange with the outside world will cause the product's speaker to become distorted or the barometer embedded inside the product to malfunction.