The number of layers is different A medical mask consists of a mask face and a tension strap. The mask face is divided into three layers: inner, middle and outer.

As the strategic cooperative unit of this event, Qingdao Weida displayed more than 20 types of daily protective masks, which were favored by friends from home and abroad.

This article introduces the selection method of KN95 masks

This article introduces the principle of dustproofing of medical masks

This article introduces the characteristics of medical masks

This article introduces the little knowledge of disposable medical masks