Heptafluoropropane is gaseous at room temperature, colorless, odorless, non-conductive, non-corrosive, environmentally friendly, and has a short atmospheric retention period. The fire extinguishing mechanism is mainly to interrupt the combustion chain, and the fire extinguishing speed is extremely fast, which is beneficial for the rescue protection of precision electronic equipment and valuables. The non-toxic reaction (NOAEL) concentration of heptafluoropropane is 9%, the concentration of toxic reaction (LOAEL) is 10.5%, and the design concentration of heptafluoropropane is generally less than 10%, which is safe for human body. Its characteristics are good cleanliness (complete vaporization in the atmosphere without residue), good gas phase electrical insulation and good physical properties suitable for use in fire extinguishing systems. In the early 1990s, industrialized countries preferred to replace the halon fire extinguishing system with heptafluoropropane and achieved success.