Why 3 Ply Face Masks and Surgical Masks are Meaningful
May 07, 2020 · The most common facemasks are the surgical masks but the main differences are; simple face masks are not used to prevent infectious diseases but a surgical mask should have a minimum of 80% bacteria filtration efficiency, a conventional face mask consists of one, two or three layers of flat or pleated fabric, usually made from paper or cotton fabric but a surgical mask is made of at least a three-ply
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