Many people know that the protective effect of KN95 is […]
Many people know that the protective effect of KN95 is much better, but they can't tell the difference between these commonly used masks. Today, we will take a look at the popular science for everyone~
Medical protective mask (KN95)
Medical protective masks are generally made into a folding cone round shape, which is our common N95 mask. Medical protective masks meet the GB19083-2010 "Technical Requirements for Medical Protective Masks" standard, and under the condition of air flow (85±2) L/min , The filtration efficiency of sodium chloride aerosol with the median aerodynamic diameter (0.24±0.06) μm is not less than 95%, which is in line with N95 (or FFP2) and above. The inhalation resistance is under the above flow conditions. The resistance does not exceed 343.2Pa (35mmH2O).
Medical protective masks need to have two core technical indicators. One is that the filtration effect of 0.3 micron diameter non-oily fine particles can reach more than 95%, and the other is that the larger diameter of 2 micron bacteria can be blocked by 100%, of course. There are also requirements for its own air permeability. This type of mask is usually used in serious infectious resource occasions. The protection of this type of mask is relatively comprehensive.
Medical surgical mask
The difference between medical surgical masks and protective masks is that the protection level of medical surgical masks is one grade lower. Medical surgical masks comply with the YY 0469-2011 "Technical Requirements for Medical Surgical Masks" standard, under the condition of air flow (30±2) L/min , The filtration efficiency of sodium chloride aerosol with median aerodynamic diameter (0.24±0.06) μm is not less than 30%; the bacterial filtration efficiency is under the specified conditions for golden yellow with an average particle diameter of (3±0.3) μm The filtration efficiency of staphylococcal aerosol is not less than 95%, and the breathing resistance is not more than 49Pa and the exhalation resistance is not more than 29.4Pa under the condition of filtering efficiency and flow rate.
Surgical masks are reflected in technical indicators. The barrier effect of 0.3 micron non-oily particles required by medical surgical masks is more than 30%, and medical protective masks such as N95 are 95%. At the same time, the barrier of 2 micron diameter bacteria must be greater than 95%, which is the BFE95 standard, is slightly inferior to KN95, but not much worse.
Disposable surgical mask
Ordinary medical masks (disposable surgical masks) comply with the relevant registered product standards (YZB) or YY/T0969-2013 "Disposable Medical Masks", generally lack of filtration efficiency requirements for particles and bacteria, or filtration efficiency for particles and bacteria The requirement is lower than that of medical surgical masks and medical protective masks, and is suitable for general protection of medical staff.