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2020-9-4 · 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.

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Synthetic blood penetration requirements: spray 2mL of synthetic blood into the mask at 10.7KPa (80mmHg), there should be no penetration on the inside of the mask. 3 Standards for protective masks. GB/T 32610-2016, the first standard for civilian protective masks of …

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