... half face gas mask 1.TPR frame 2.double-cartridge filters 3.matched with 3#/ ... 40 ContainerFD-2 is used with 3# or 7# filters 3# (HX-3)Used to prevent organic gas and steam ... , chloromethane, nitroalkane. 7# (HX-7)Used to prevent acid gas and steam damage to human body, such as ... dioxide, chlorine, hydrogen sulfide, nitrogen oxide, phosphorus and chlorine organic pesticid.You May Also LikeFD-1 gas ...