Hangzhou n95 mask is good.
3M N95 level 1860, 9132 two medical masks, with other N95 protection level masks is the difference between a layer of green anti-liquid splash layer; more fall bacteria up to the standard test (hospitals on the medical device product itself bacteria requirements), in addition to these two points, all the N95 masks on the virus, haze, the protective effect is the same.
As long as the product meets the N95 standard and passes the NIOSH review, it can be called "N95 type mask". An N95 rating means that the filter media is 95% effective in filtering non-oily particulate matter (e.g., dust, acid mist, paint mist, microorganisms, etc.) under the testing conditions specified in the NIOSH standard.
N95 mask correctly accompanied by wearing method
1, the first headband every 2-4 cm to pull loose, the hand through the mask headband, metal nose bit forward.
2, put on the mask and close to the face, the upper end of the mask headband position placed behind the head, and then the lower end of the headband pulled over the head, placed behind the neck, adjusted to a comfortable position.
3. Press the fingertips of both hands along the metal strip of the nose bridge, from the center to the sides, slowly inward until it fits snugly on the bridge of the nose.
4. Cover the mask with both hands as much as possible and perform the positive and negative pressure tests. Positive pressure test: Cover the mask with both hands and exhale vigorously. If air escapes from the edge of the mask, the mask is not being worn properly and the headgear and metal bars of the nose must be adjusted again.
5. Negative pressure test: Cover the mask with both hands and exhale vigorously. The center of the mask will be sunk, if air enters from the edge of the mask, it is improper to wear, and you have to adjust the headband and the metal strip of the bridge of the nose again.
Reference: Baidu Encyclopedia-N95 mask