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china drawstring bags manufacturers cjeap personalized drawstring bags wholesale custom made in china suppliers manufacturers…..Content: several common dust masks dust can really do ? [ Original 2014-1-13 9:16:01 ] Font Size: medium and small market common dust masks have the following four categories: disposable masks, gauze masks, dust masks with activated carbon , etc. are sold . Salesperson said this two days to ask the public and traded masks significant increase with activated carbon dust masks are selling particularly well . Integrated pharmacy clerk and the doctor's advice , I'll give the common market were analyzed several masks , masks for everyone when you pick the reference ( to remind , to the shop to buy a mask quality is better to have a certificate of authorization , which must be Please check your own pro ) . ● 3-layer non-woven disposable surgical mask effect: to filter particles in the air , blocking droplets , secretions , etc. Where to buy : ordinary pharmacies and Lynx Taobao shop , pharmacy prices generally in the 4 yuan / only advantages: relatively breathable , light weight , easy to carry , cheap Disadvantages: ineffective blocking dust particles , one-time use only ● cotton gauze masks ( 4 layers, 12 layers , 16 layers ) effect: certain air particulate filter
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