Heptafluoropropane (HFC-227ea), chemical formula C3HF7, is composed of three elements: C (carbon), F (fluorine), and H (hydrogen). It is completely vaporized in the atmosphere without residue, non-conductive, and generally does not cause secondary pollution. In addition to museums, it is also good for saving electronic equipment, precision instruments, valuable instruments and archives and other paper, silk or magnetic media materials. Extinguishing agent.
Heptafluoropropane is relatively stable at room temperature and will decompose when heated. In the actual fire extinguishing process, heptafluoropropane fire extinguishing is done through chemical and physical reaction together.
Heptafluoropropane and air conditioning refrigerant belong to the same category, so it is an effective heat conversion agent. The physical fire extinguishing effect is to absorb the heat energy in the fire through vaporization, resulting in a decrease in the flame temperature. The chemical reaction is thermal decomposition to produce fluorine-containing free radicals such as CF3, CF2, CF3, CFO, and CFO, thereby interrupting the chemical chain reaction in the combustion process.
Most importantly, heptafluoropropane extinguishes fire quickly.
During the development of a fire, the early fire is best controlled. If the early fire cannot be extinguished in time, it will be difficult to extinguish the fire further developing. Moreover, lethal combustion products such as high temperature and smoke are produced most in the initial stage of combustion. Choosing fire extinguishing equipment with fast fire extinguishing effect is a key measure to prevent fire from occurring and spreading rapidly.
Ordinary fire extinguishing agents take 60 seconds or more to produce a fire extinguishing response. The discharge time of heptafluoropropane is less than ten seconds, which can extinguish the fire before the fire has developed, and there will be no re-ignition after completion (suffocation type extinguishing agent Prone to re-ignition). Fast reaction and excellent combustion suppression ability can avoid catastrophic fires.
To evaluate the impact of a fire extinguishing agent on the environment, its direct and indirect impact on the environment should be considered. Heptafluoropropane does not contain chlorine or bromine, does not destroy the ozone layer after extinguishing, and the ozone layer potential value ODP is 0. It is a clean fire extinguishing agent. Heptafluoropropane has a greenhouse effect after extinguishing fire. The greenhouse effect index value GMP is 3220, but since it is only released when a fire occurs, its impact is almost negligible.
Since it can meet the requirements of clean gas fire extinguishing system in terms of fire extinguishing performance, protection object safety, human safety, and environmental impact, heptafluoropropane is considered to be a product that has successfully replaced halon fire extinguishing agent and has been widely used in Europe and America. At present, NFPA2001 (American clean chemical fire extinguishing system design standard), ISO14520 (European gas fire extinguishing system design standard) and GB50370 (Chinese gas fire extinguishing system design code) all incorporate heptafluoropropane fire extinguishing system into their standard system.