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2020-7-1 · Cui says a two-layer tight-weave cotton mask alone can filter out about 35% of small particles. But adding a filter made out of two layers of charged polypropylene could boost that filtration ...

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2020-4-27 · When it comes to filtering out airborne particles, not all fabrics were created equal. New research suggests a combination of cotton with natural silk or chiffon makes for the most effective mask.

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2020-4-8 · Guidelines for public mask, purchased or DIY 4.8.20 General principles • Have the front of your face (your nose and mouth) covered as effectively as possible. This is where the virus gets into our body from talking to people face to face, or walking with our head facing forward into a new (potentially contaminated) airspace.

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