... and oil-free particles.*Adjustable nose piece provides a custom seal for different facial size*Exhalation valve ... repellent and air permeability*Maintenance/cleaning free, folding,convenient to use*Recommended applications: Hardware, plating, mining, chemical, sterilizing, spray ... -woven face mask,particulate resirator.**Quality control.A) Vic mask use polypropylene as the main materials,without any ...