... to 99.1%. This rate is much higher than normal standard of 98%1.Soft, lightweight, comfortable, odorless2.Fiberglass free, ... , harmful airborne chemicals and fine particlesSpecification:1.Material:3-Ply 20gsmPP+20gsm PP+ 25gsm PP2.Dimension:17.5×9.5cm3.Packaging: ... available such as white, blue and green6.We adopt materials produced by machinery face mask with wrap and spot welding,middle ply is ...