Medical surgical masks must comply with my country's pharmaceutical industry standard number: YY 0469-2011, "Technical Requirements for Medical Surgical Masks". The main technical indicators are as follows:
Filtration efficiency: Under the condition of air flow (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%.
Bacterial filtration efficiency: under the specified conditions, the filtration efficiency of Staphylococcus aureus ATCC6538 is not less than 95%; 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; synthetic blood penetration : 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.
Before use, please check whether the packaging is in good condition, confirm the external packaging mark, production date, and validity period, and use it within the sterilization validity period; make sure that the mask covers the bridge of the nose to the jaw after unfolding to obtain the expected protective effect; disposable medical Surgical masks are not allowed to be reused; if the packaging of medical surgical masks is found to be damaged before use, it is prohibited to use them.