The quality requirement of medical mask is relatively high, which is composed of mask body and tensioning band. The mask body can be divided into three layers: inner, middle and outer layers. The inner layer is ordinary sanitary gauze or non-woven cloth, the middle layer is ultra-fine polypropylene fiber melting material layer, and the outer layer is non-woven or ultra-thin polypropylene melting material layer.The outer layer is designed to prevent droplets, the middle layer is filtered, the inner layer is hygroscopic, and the mask is made of non-woven fabric.The mask, designed to protect doctors from droplets and splashes, also has a particulate filtration rate of just over 30 percent and a bacterial filtration rate of more than 95 percent.This three-layer configuration makes the parvovirus filtration very good, and the material is not toxic, making it a very good medical mask.

In fact, medical masks can not only be carried by doctors at any time, but also be used by ordinary residents in case of bad air to protect their respiratory system and protect their health.How to deal with the expiration of the medical mask according to the requirements of disposable medical mask expiration is not allowed to enter the clinical use but personal protection can be used if the mask packaging is not damaged and polluted.To be on the safe side, it's recommended to disinfect before handling, or to switch to a new product.As in general operations, the surgical masks used by surgeons are disposable masks, which are thrown away after the first use. To ensure the safety of the next operation, brand-new medical masks will be used.