PU (Polyurethane, PU), is in the macromolecular main chain contains carbamate base polymer called Polyurethane.Many people may not know that polyurethane is widely used in the production of filter elements in "air filters".Why especially polyurethane?Because a number of related research data have confirmed that polyurethane has excellent filtering effect on dust in the air and PM2.5.
NCBI, the national biotechnology information center of the United States, has published such a research test results, pm1-0.5 removal rate: > 99.00%, PM2.5 -1 removal rate: > 99.73%, even smaller than PM2.5 PM0.3 removal rate reached 60%.Thus, polyurethane has excellent protection against PM2.5 and various other diameters of dust and is harmless to the body.
And well-known polyurethane masks will belong to Australia grassroots masks and Japan PITTA MASK, both relatively than speaking Japanese PITTA MASK material particularly like a thin layer of "sponge", the surface is very "rough", feels very acerbity, can very clearly see the material of interlocking "texture" and the "gap" between (once had many stars with);While the Australian mask is very "smooth" to the touch, very thick, can not clearly see the texture.
It was found through the experimental detection (with flour and hair dryer as the experimental subjects) that PITTA MASK could not effectively protect the flour particles living under the influence of the wind of the hair dryer.And the Australian mask, although I can not measure PM2.5, but for flour particles, its protective effect is very good!
Masks are not expensive products, but, in this particular period of the epidemic, like sunscreen, "protection" for the purpose of the product, once the quality problems, the consequences are often very serious.Imagine if you're wearing a mask that can't even protect you from flour, and you're still expecting it to protect you from PM2.5?Not to mention a protective novel coronavirus.
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