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LIBANGSHUN KF94 FAMILY 1\ Adult 5PCS per pack WHITE 2\ Adult 5PCS per pack BLACK 3\ Adult 20PCS per box WHITE 4\ Adult 20PCS per box BLACK 5\ KIDS 5PCS per pack WHITE More choices, More health ------------------------- Libangshun Facemask is a loose-fitting, disposable device that creates a physical barrier between the mouth and nose of the wearer and potential contaminants in the immediate environment. These are often referred to as face masks, although not all face masks are regulated as surgical masks.type of nursing(fish) ------------------------ Material：Non-woven Fabric, Thermal Insulation Cotton Brand ：Libangshun Weight：6g /24g Mask Color：adult: white/black; kids: white Quantity：5 PCS / Pack; 20PCS/Pack Produr Standard : GB2626-2006 ------------------ The KF94 mask is a standard produced by South Korea. According to the data on the official website of the Korean Food and Drug Administration (MFDS), the mask under this standard has a filtration rate of more than 94% for particles with a diameter of 0.4μm. In other words, the KF94 standard mask can filter out at least 94% of particles with a diameter equal to 0.4μm. Therefore, KF94 is similar to KN95 and N95. They are all masks under the same protection level, but the protection ability is different. This standard can effectively block the common vector of viruses: droplets. The diameter of the droplets is generally between 1~4μm. The filtering effect of the KF94 mask can prevent the droplets from directly contacting the human respiratory tract and prevent virus invasion.