... to 99.1%. This rate is much higher than normal standard of 98%1.Soft, lightweight, comfortable, odorless2.Fiberglass free, ... air passage and breathable5.In clinical offices, housework, gardening and maintenance for filtering dust, pollen, and bacteria6.In laboratories and factories for ... .We adopt materials produced by machinery face mask with wrap and spot welding,middle ply is filter,blue,17.5* ...