resuable protective sponge dust mask,active carbon 1. Standard:FFP1,FFP2,FFP3, ... ,N99,R95, 2. Material:sponge 3. BFE:95%,99 resuable protective sponge dust mask with active carbon 1.Description:Product Name ... ,Semi-Conductor,Precision Manufacturing,Food,Cleaning Work,Battery,Building Materials,Chemical Synthesis,Nuclear Engineering,Minning,Petroleum,Shipbuilding,Metallurgy,Coal,Environmental Sanitation ...