Respirator is a kind of mask, whose canister can filter toxic gas and fine dust efficiently. It can be used in industry, agriculture and research work and others. The respirator is equipped with different canister in accordance with different requirements in different environments. Properties: 1. Efficient Adsorption and Filtration The canister is filled with activated carbon of high quality that can filter efficiently toxic gas such as organic vapors, solvents, acid gases, halogens, sulfur dioxide, ammonia, mercury, fine dust and sprays and so on. 2. Comfortable Wear Silicon rubber is applied in our mask which makes the wearer comfortable. 3. Long time of toxic gas resistance 4. Perfect air permeability 5. Low breathing resistance