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@mcclure111 the instructions for the non woven polypropylene masks i made said to sterilise it by submerging it in boiling water for 10 minutesPermalink Look on archive.org
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@mcclure111 was trying to find the paper i saw before comparing different fabrics. but this one seems relevant, too: researchgate.net/publication/258525804_Testing_the_Efficacy_of_Homemade_Masks_Would_They_Protect_in_an_Influenza_PandemicLook on archive.org
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@mcclure111 "Both masks significantly reduced the number of microorganisms expelled by volunteers, although the surgical mask was 3 times more effective in blocking transmission than the homemade mask."Permalink Look on archive.org