1 day ago· Based on the exhalation valve, the global N95 market is classified into a mask with an exhalation valve and mask without exhalation valve. Masks with the exhalation valve …
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Surgical masks generally use three layers of thin polypropylene, while respirators have 4 layers of which one is a support layer. Protection from microbes might be possible by using antimicrobial fabrics that have a wide spectrum of activity, such as those treated with the Antimicrobial Silvadur .