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.