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About Face Mask

Medical masks are generally composed of melt-blown cloth, non-woven fabric, mask tape, and nose clip. The outer and inner layers are made of non-woven fabric, and the middle layer is made of melt-blown fabric. The outermost layer of the mask has an anti-fog design, the middle layer is the core functional layer, which is used to filter droplets, particles or bacteria, and the inner layer is mainly hygroscopic.
The main filter material is polypropylene melt-blown cloth, which is a kind of ultra-fine electrostatic fibre cloth. Due to the electrostatic effect, it can capture dust. After the droplets containing various viruses are close to the polypropylene melt-blown cloth, they can be adsorbed on the melt-blown cloth The surface cannot penetrate. Suitable for flat mask melt-blown filtration levels are: ordinary, BFE95 (95% filtration efficiency), BFE99 (99% filtration efficiency), VFE95 (99% filtration efficiency), PFE95 (99% filtration efficiency), KN90 (90% filtration efficiency ). The melt-blown cloth is generally selected with a weight of 20grams. The higher the weight, the better the protective filtering effect. The N95 uses 40 grams or even higher. Of course, if there are too many layers of non-woven fabric, the mask will be relatively hard, while if there are too many layers of melt-blown, it will be difficult to breathe.
Other materials: Metal/PE for nose clip, Elastic Material for ear loop,  etc.
How Medical Masks Work
Most medical masks are self-priming filter masks. The working principle is that the air containing harmful substances is filtered through the filter material of the mask and then inhaled or exhaled.