Disposable medical surgical masks are made of 3 layers of material, the darkest color should be worn on the outside, made of waterproof, splash-proof material, while the innermost layer is white or light-colored, this layer is made of moisture-proof and water-absorbent material, while there is a middle layer between the two layers is also the core layer of the mask, which is made of soluble spray cloth, which has the function of adsorbing and filtering fine particles and viruses and pathogenic microorganisms. Therefore, disposable medical masks are composed of three layers, and the design structure of PM2.5 or anti-particle masks is not the same, so you cannot take ordinary gauze masks, sponge masks or other civilian masks to replace medical surgical masks.