... SO2 1.Purpose and CharacteristicMF25 half face piece gas mask is apply to the workers, who work in ... The product’s components are the body of half face mask, the cartridge, exhale valve, rubber headbands. The headbands ... at once and change a new one. The air tightness of the half face piece needs to be checked ... matched the product from our agency.5.2 The mask should be stored in the cool and dry place, ...