As we all know, air pollution is serious nowadays, people wear masks when they go out. However, many people will buy disposable medical masks to ensure their health. However, few people know that medical masks have an expiration date, so I will give you a brief introduction and hope it will be helpful to you.
Medical masks have high quality requirements and consist of a mask body and a tension band. The mask body can be divided into three layers: inner layer, middle layer and outer layer. The inner layer is ordinary sanitary gauze or non-woven fabric, the middle layer is an ultra-fine polypropylene fiber melted material layer, and the outer layer is a non-woven fabric or ultra-thin polypropylene melted 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 is designed to protect doctors from droplets and splashes. Its particle filtration rate is only over 30% and bacteria filtration rate is over 95%. This three-layer configuration makes the parvovirus filter very good, and the material is non-toxic, making it a very good medical mask.
In fact, medical masks can not only be carried by doctors at any time, but also can be used by ordinary residents to protect their respiratory system and ensure their health. How to deal with the invalidation of disposable medical masks? The invalidation of medical masks is not allowed to enter clinical use, but if the mask packaging is not damaged or contaminated, personal protection can be used. For safety reasons, it is recommended to disinfect before processing or switch to a new product. For example, in a general operation, the surgical mask used by the surgeon is a disposable mask, which is discarded after one use to ensure the safety of the next operation, and a brand new medical mask will be used.
