Medical surgical masks mainly use polypropylene as the main raw material. These ultra-fine fibers with unique capillary structures increase the number and surface area of ​​fibers per unit area so that the meltblown cloth has good filtering and shielding properties. Below, China Surgical Mask Manufacturers introduces the technical indicators of surgical masks:

(1) Filtration efficiency: under the condition of airflow (30±2) L/min, the filtration efficiency of sodium chloride aerosol with aerodynamic median diameter (0.24±0.06) μm is not less than 30%;

(2) Bacterial filtration efficiency: Under the specified conditions, the filtration efficiency of Staphylococcus aureus ATCC6538 is not less than 95%;

(3) Pressure difference: Under the specified conditions, the pressure difference between the two sides of the mask for gas exchange should not be greater than 49Pa;

(4) Penetration of synthetic blood: After 2ml of synthetic blood is sprayed to the outer side of the mask at a pressure of 16.0kPa (120mmHg), the inner side of the mask should not penetrate.