The medical surgical mask is suitable for the basic protection of medical personnel or related personnel, as well as the protection of preventing the spread of blood, body fluid and spatter during operation. Mainly in the cleanliness of less than 100,000 clean environment, operating room work, nursing patients with low immune function and coelomic puncture and other operations to wear. Medical surgical masks can block most bacteria and some viruses, can prevent health care workers from being infected, but also can prevent health care workers from directly discharging the microbes carried in the air, posing a threat to patients undergoing surgery. For suspicious respiratory patients, disposable surgical masks should be issued to prevent the risk of infection to other personnel in the hospital and reduce the risk of cross-infection, but the efficacy of preventing infection is not as good as medical protective masks.

YY0469-2004"technical requirements for medical surgical masks" standard, important technical indicators include filtering efficiency, bacterial filtering efficiency and suction resistance. Specific indicators are as follows:

1. Filtration Efficiency: Under the condition of air flow rate (302) L/min, the filtration efficiency of sodium chloride aerosol with median diameter (0.240.06) m of aerodynamics is not less than 30% .

2. Bacterial Filtration Efficiency: Under the specified conditions, the filtration efficiency of Staphylococcus aureus Aerosol with average particle diameter of (30±0.3) μm should not be lower than ; the filtration efficiency of bacteria should be ≥ ; the filtration efficiency of non-oil particle should be ≥30% .

3. Suction Resistance: under the condition of filtration efficiency flow rate, the suction resistance does not exceed 49 PA and the air resistance does not exceed 29.4 Pa. When the pressure difference △ P is 49Pa / cm, the gas velocity should be ≥264mm / S.

4. Nose Clip and Mask Belt: Mask should be equipped with nose clip, which is made of plastic material and should be longer than 8.0 cm. The respirator belt should be worn easily. The breaking force at the connection point between each respirator belt and the respirator body should be greater than 10N.

5. Synthetic Blood Penetration: After 2 ml of synthetic blood is sprayed to the outside face of the mask at 16.0 kPa (120 mmHg) pressure, there should be no penetration on the inside face of the mask.

6. Flame-retardant Performance: Mask material should be used non-flammable materials, masks after leaving the flame combustion less than 5s.

7. Oxirane Residue: For oxirane respirators, the oxirane residue should be less than10μg/g.

8. Skin Irritation: The primary irritation index of mask material should be less than 0.4, and there should be no sensitization reaction.

9. Microbiological Index: The total number of bacterial colonies is less than 20CFU/g, and no coliform bacteria, pseudomonas Aeruginosa, Staphylococcus aureus, hemolytic streptococcus and fungi should be detected.