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custom drawstring bags,wholesale drawstring bags,drawstring bags manufacturers
china drawstring bags manufacturers cjeap personalized drawstring bags wholesale custom made in china suppliers manufacturers….., blocking fly Mo , secretions, where to buy adsorption ability : general pharmacy , Lynx Taobao shop , pharmacy prices generally in the 3 yuan / only advantages: can be reused after cleaning , cheap Disadvantages: poor ventilation, allergic skin should not wear ; fibers are generally very thick, limited to five microns or less in diameter dust dust barrier efficiency , only about ten percent ; contact with the inner surface portion of the nose and mouth masks would have saliva , if not diligent in cleaning, easy to breed bacteria. ● N95 mask effect: droplet precautions for PM2.5 particles have a certain effect . N95 masks are NIOSH ( U.S. National Institute for Occupational Safety and Health ) certified nine kinds of anti- particulate masks in one . "N" is not meant for oily particles ( soot is produced cooking oil particles , while people speak or cough droplets produced not oily ) ; " 95 " means , in the NIOSH standard testing conditions, the filter 95% efficiency . N95 is not a specific product name. They meet the N95 standard, and the review by NIOSH products can be
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