Acetylene, which provides the highest temperature flame of all gases, is used by the construction industry for cutting and welding at very high temperatures.

EspriGas Welding Gas Refill, Acetylene Gas, 10 cu-ft Capacity, Mild Ethereal, 0.906 Specific Gravity, -18.15 deg C Closed Cup Flash, -75 deg C Boiling, 52 deg C Storage, 0.907 Vapor Density, 635 lb/sq-in Vapor Pressure, 2.3% Lower, 100% Upper Flammability Limit, -81.8 deg C Melting Point, Colorless

• SDS https://assets.unilogcorp.com/267/ITEM/DOC/EspriGas_311040_SDS.pdf