... C6H6,CL2 SO2 1.Purpose and CharacteristicMF25 half face piece gas mask is apply to the workers, who work in ... on. The product’s components are the body of half face mask, the cartridge, exhale valve, rubber headbands. The headbands can ... , it should be kept straight, stayed close to the face , warped the mouth and nose, and the both sides ... Storage life: more than 5 years. MF25 half face piece gas mask