... mask, (1) High quality silica gel. (2) ISO 9000, (3) Material replacement easy, ... superior sealing performance, wearing comfort.[Performance] : Effective filtration of gas, benzene, chlorine, chloroform and other toxic gases.[Model] ... 9001[Standard] : GB2890-1995 ISO2000[Applications] : Toxic gas environment. [Packing] : Carton Packaging(53*27*33),A ... -end Respirator Mask of good quality for industry