Compressed air cylinders are: odor less, color less and non-toxic. It does not burn but supports combustion. The benefits are: when it is combined with a fuel gas, produces a flame with a lower temperature than an oxy-fuel flame. The air-fuel flame is suitable for brazing and soldering applications with lower-temperature alloys. Used in preference to oxygen because it gives a greater level of adjustment, allowing the thickness of the carbon coat to be varied .Applications are: brazing and hard soldering, can be used in alternative applications such as plasma-cutting, used in metallurgical processes such as die-casting and blast furnaces, compressed air cylinders are an alternative to a compressor, used to drive pneumatic drills, can be used in the carbon-coating processes. An air-acetylene flame is used to produce carbon which can be deposited onto the surface of a component to act as a release agent. Carbon-coating is used for aluminum extrusion and glass manufacture as a mould-release agent