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In addition, EN14683 place requirement on the the microbial cleanliness of the mask itself, i.e. the masks must be sterilized at production. EN14683 & ASTM F2100 comparison. SourceNelson Labs
Mar 27, 2020 · FDA is allowing the distribution and use of certain medical device requirements for FDA regulated face masks, with or without a face shield (not including respirators), face shields and surgical masks if manufacturers and distributors implement defined measures to prevent undue risks. FDA will not enforce premarket notification (510k
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The filtering materials of respirators and medical masks are typically nonwoven. These materials, initially using natural fibers, came into greater prominence with the introduction of synthetic thermoplastics, particularly polypropylene, about 40 years ago.
Lets look at the result presented below in Figure 1 of the literature, wearing multiple masks at a time only slightly increases the median filtration capacity from 2.7 to 3.8 or 5.5 for wearing
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