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By certification 
Features:
1.Offering superior levels of protection choose from a wide selection of face masks and face protection.
2.Unique surface water resistance and soft lining.
3.Non-irritating, glass fiber free and latex free.
4.Disposable, single-use, light and environment-friendly;
5.High elasticity ear loop help fit different users and dual point attachment helps provide a secure seal;
6. Adjustable nose piece for extra comfort;
7.At least 95% filtration efficiency against certain non-oil particles.
A KN95 respirator is a respiratory protective face mask, designed to help reduce the user's exposure to airborne particles including very small particles (0.3 microns) and large droplets. KN95 respirator face mask literally has a filtration efficiency of at least 95% against non-oily particles
The KN95 is a standard for respiratory equipment which filters 95% of particulates greater than 0.3 microns. They offer significant protection over standard surgical blue 3 ply masks and are approved by the CDC as acceptable replacements if N95 masks are unavailable.
KN95 is an industry-standard and means that the mask provides the intended effectiveness of filtering 95 percent of particles with a mass median diameter of 0.3 micrometers. Therefore, our mask can protect you well from PM10, PM2.5, and even smaller particles. In summary, They are basically all the same. They stop 95% of particles > 0.3 microns in size. The N95 is the USA Code, KN95 is China code, KF94 is Korea code and FFP2 is the EU code, this includes the UK. KN95, KF95 and FFP2 face masks are N95 face mask alternatives & N95 equivalents. They are all the same.
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