Abstract: The overall weight of SCBA can cause great physical exertion on firefighters, causing the actual respiratory protection time to be greatly shortened. Not only will it seriously affect the efficiency of fire and rescue operations, but it may also create important safety hazards for firefighters' personal safety. This article introduces the development process and key technologies of a lightweight type III fully wrapped composite gas cylinder for SCBA. By optimizing the structure of the cylinder and using high-strength new materials, the mass of the cylinder is reduced by 22.3% compared with similar products, and the carrying capacity and safety of the cylinder are significantly improved, which significantly reduces the physiological burden on firefighters and prolongs the breathing of the respirator.

Key words: lightweight, fully wrapped composite gas cylinders;SCBA