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Given CDC recommendation to use home made masks in the event of a mask shortage, here is a comparison of filtration properties of different materials ...
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Cambridge scientists tested 0.02 micron Bacteriophage MS2 particles (5 times smaller than the coronavirus) & compared homemade masks made of different materials to surgical masks. Surgical mask blocks 89% Vacuum cleaning bag 85% Dish Towel 73% T shirt 70% #macgyvercare
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But what kind of tea towels? They are made out of various fabrics, cotton, linen, cotton/line blend. Some are tightly woven, some more loosely. Not sure what use this category is. My own tea towel stash has many kinds of towels. Some I like better than others for drying dishes.
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