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Therefore, in the standards for medical protective masks, special test methods are used to test the liquid barrier properties of such products; in addition, medical protective masks are not allowed to he an exhalation valve. This is because when medical protective masks are allowed to be used as surgical masks, if a mask with an exhalation valve is worn, the microorganisms carried in the exhalation will be directly discharged from the mask, posing a threat to patients undergoing surgery. Compared with traditional mechanical filtration, electrostatic filters he higher filtration efficiency and can better absorb ultra-fine dust. The filter material of a good protective mask should meet the following three conditions: high filtration efficiency and low breathing resistance. When the mask fits the user's face well, it gives the user a comfortable feeling. Because the masks all pass the American niosh standard, the filtering effect of micron-level non-oily particles reaches 95%.

How often the KF94 mask is changed depends on the situation, and cannot be generalized. Its use time is related to the use environment, different particle concentrations, properties, storage methods, personal habits and other factors. First of all, we must know what KF94 mask is. Each country and region will divide the index data of different masks. Generally, N/R/P series are American standards, KN/KP series are Chinese standards (GB2626), FFP series are European standards, KF is the abbreviation of KoreanFilter, and KF series are mainstream mask standards issued by the Korean Food and Drug Administration. The KF series are divided into KF80, KF94 and KF99. The filtration efficiency of KF94 masks is 94%, that is, at least 94% of particles with a diameter of 0.4μm can be filtered out. Both oily and non-oily particles can reach the same level. Non-oily particles include dust, paint, microorganisms, etc.