Surgical masks are used for wearing in the mouth and nose of medical personnel in the operating room to prevent the spread of dander and respiratory microorganisms to the open surgical wound, and prevent the transmission of body fluids from surgical patients to medical personnel, playing a role of two-way biological protection.

Main Technical indicators

Surgical masks shall comply with The Technical Requirements for Medical Surgical Masks issued by YY 0469-2011, a national medical industry standard. The main technical indicators are as follows:

(1) Filtration efficiency: The filtration efficiency of the aerodynamic median diameter (0.24±0.06) m sodium chloride aerosol was not less than 30% under the condition of air flow rate (30±2) L/min.

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

(3) Pressure difference: Under 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 onto the outer side of the mask at a pressure of 16.0kPa (120mmHg), no penetration should occur on the inner side of the mask.