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The wearing of face masks during the COVID 9 pandemic has received varying . Filter material may be made of microfibers with an electrostatic charge that is
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3 Apr 2020 Australia middot English middot Austria middot Deutsch middot English middot Bangladesh middot English middot Belgium China issued an updated version of its mandatory national standard GB 262620 9 SG 04 20 Man in Mask For example the filter element of KN 90 shall be marked as GB 262620 9 KN90.face piece and fullface piece.
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Face masks during the COVID 9 pandemic Wikipedia
The wearing of face masks during the COVID 9 pandemic has received varying Surgical masks made to different standards in different parts of the world have different and only filter larger particles e.g. Chinese standard YY/T0969 masks . Hard electretfilter respirators N95 US /FFP EU /P2 Australia etc. standard