Anti-penetration face mask

4ply anti-penetration nonwoven face mask Size:9.2(18)×18cmMaterial:18g/m2 wet-laid nonwovens(or 22 g/m2 pp)+anti-penetration punching membrane+24g/m2 melting-blown pp+25g/m2 calendering pp.Packing:50pcs/box,6box/carton or 20box/carton.Function:4-py structure,effectvely prevent from bacteria and dust,high efficiency in resisting penetration,BFE up to 99%Production technique:ultrasonic machine-sewed with tie and nosepiece Application:Suitable for casuatly wards,infection wards surgery rooms,medical sainitation,scientific experiment,chemical industry and paarmancy. Our labortary