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Apr 06, 2020 · The material should be thick and densely woven, like a kitchen towel or heavyweight t-shirt, and the mask should fit tightly around the nose and mouth with no gaps, she told us in an email. Comparison of Mask Standards, Ratings, and Filtration 3M is a company that manufactures masks. They generally produce masks that meet KN95 or N95 standards. PM2.5 vs. N95. As we now know, N95 is a mask rating. PM2.5 refers to particulate matter or a fancy way of saying pollution particles that are in the air. The 2.5 refers to the size of these particles as being 2.5 microns or smaller. Perfessional Medical Mask Disposable 3-Ply Face Mask 10 100 x Disposable 3-Ply Face Mask. About Perfessional Medical Mask Fast Felivery:Global Free Shipping, United States 3 5 Working Delivery! Other countries 7-10 Working Delivery! Due to the coronavirus, the delivery time will be delayed to varying degrees, this depends on the global courier flights and the bans in various countries and cities.
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Two-layer masks performed better than single layer masks, he says. This is probably because the small particles would have to find their way through both layers to pass through the mask.