Surgical masks are actually relatively simple, nothing more than three layers. The outer layer is waterproof and liquid-repellent, the middle layer absorbs particles and plays a filtering role, and the inner layer absorbs moisture. ?

The middle layer is required to be meltblown cloth, which belongs to industrial raw materials and is made of a kind of material called? Meltblown? The nonwoven fabric made by this process only has good filtration effect. ?

Coronavirus is 80 ~ 120 nm, which is usually greater than 0. 1um because it is usually attached to body fluids. I forgot how much it was. Please check the filter diameter when buying.

0. 1 micron = 100 nm

Look at the filter paper without writing. Three-layer meltblown fabrics are generally made of polypropylene, and the fiber diameter can reach 0.5- 10um. If it is a virus attached to body fluids, it can be filtered out.

The filter material of labor protection mask can meet the European standard EN 149, American standard NIOSH42 CFR-84, Japanese standard MOL and China 2626 dust mask standard.

It can be made into European standards FFP 1, FFP2, FFP3, American standards N95, N99, N 100, R95, R99, Japanese standards DS 1, DS2, national standards KP90, KN95, KN 100.

Therefore, it is concluded that meltblown cloth is the best and most useful piece of cloth for filtration, so it can become the heart.