It is suitable for health care in general medical environments where there is no risk of body fluids and splashing by the wearer and general health care in public health places. (This product cannot be used as a surgical or protective mask) Main performance: The air permeability should not be less than 0.10m/s, the filtration efficiency for non-oily particles should not be less than 20%, the ventilation resistance of the gas exchange on both sides of the mask should not be greater than 49Pa/cm2, and the bacterial filtration efficiency of the mask should not be less than 95%, the residual amount of ethylene oxide does not exceed 10ug/g. ***This product is only for retail and does not accept wholesale and customization. Our company purchases from regular pharmacies in China, with quality assurance and complete bills.