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Due to the proliferation of "", counterfeit KF masks are being sold at high prices, and local governments and the Food and Drug Administration are focusing on cracking down on this behior. An official from the Special Judicial Police Corps of Gyeonggi Province explained that "if the masks are not printed with KF certification, but are only produced as'industrial products' masks, it is not illegal in itself", "These masks are mainly faked through online shopping. Publicity and exaggerated sales, so we focus our energy on hitting the sellers."

The Department of Food and Drug Safety recommends that when purchasing masks, you should check whether the product has KF certification through the Comprehensive Pharmaceutical Information System (https://nedrug.mfds.go.kr). A related person said: "When carrying out KF certification, the Food and Drug Administration conducted strict inspections through external agencies on indicators such as leakage rate and inhalation resistance that are closely related to the use effect and use experience." "If you use masks with no guarantee of quality Not only may it not he the effect of blocking fine particles, but it may also cause breathing discomfort, so people need to pay attention."

Medical surgical masks and medical protective masks are sterile masks frequently used in medical institutions. Medical surgical masks are mainly used for general operations and surgical applications, and can prevent particles with a diameter of 3 microns from filtering up to 95%. Medical protective masks he a higher level of protection and are the protective masks that must be worn in epidemic prevention.