kf94Mask appearance inspection standard Mask visual inspectionequipmentMask appearance inspection standard

Medical masks are generally divided into three types: cotton gauze masks, medical surgical masks, and masks. They are characterized by: cotton gauze masks: They can prevent a part of the invasion, but they he poor adhesion to the human face and low efficiency. Medical surgical mask: divided into three layers, the outer layer blocks water, the middle layer blocks more than 90% of 5μm particles in the air, and the inner layer absorbs moisture. Medical protective mask: It is certified by the American Institute of Occupational Safety and Health. n refers to non-oily particles, 95 refers to a filtration rate of 95% under the test conditions specified in the standard, which has good adhesion. Wear a surgical mask when working in the operating room or nursing patients with weakened immune function, and when performing body city punctures.In the face of surging new models, wearing a mask when going out is an ideal personal protection measure. In the early stage of the epidemic, the wearing of medical surgical masks and N95-level protective masks advocated by our beloved Academician Zhong Nanshan became popular.

So, what exactly is the N95 mask that everyone pursues?

In fact, N95 is not a specific product name, but a standard. Products that pass the National Institute of Occupational Safety and Health (NIOSH) review can be called "N95 masks."

"N" means not oil resistant, and "95" means exposure to a specified number of special test particles. The particle concentration in the mask is more than 95% lower than the particle concentration outside the mask. The protection level of N95 means that under the testing conditions specified in the NIOSH standard, the filtering efficiency of the mask filter material to non-oily particles (such as dust, acid mist, paint mist, microorganisms, etc.) reaches 95%. The N95 mask is one of the nine particulate protective masks certified by NIOSH.

Generally speaking, N95 masks and KN95 masks he the same protective effect. The difference is that KN conforms to Chinese standards and N conforms to American standards.

In China, KN95 means that the filtration efficiency of non-oily particles with a diameter of 0.3μm is greater than 95%. In the NIOSH standard, N95 has a 95% blocking success rate for particles with a diameter of 0.075 microns.