As a kind of gas fire extinguishers, heptafluoropropane is a popular gas fire extinguishing material in the market at present. Its efficient fire extinguishing efficiency and the characteristics of no secondary pollution have been favored by the majority of users. With the national attention to fire protection, heptafluoropropane fire extinguishing system has gradually become the best choice for computer rooms, power distribution rooms, archives, important databases, containers, museums and other places with important information and property. However, with the widespread use of heptafluoropropane, people began to question whether heptafluoropropane is harmful to human body. After all, it is a chemical agent, and today we will talk about this issue in detail.
What is heptafluoropropane? Heptafluoropropane is a chemical fire extinguishing gas composed of hexafluoropropylene and hydrogen fluoride, which is used to replace halon fire extinguishers that destroy the ozone layer of nature. According to heptafluoropropane (HFC227ea) fire extinguishing agent gb18614, heptafluoropropane should be 1,1,1,2,3,3,3-heptafluoropropane according to China's chemical system nomenclature, which is called HFC227ea according to the international general halogenate nomenclature, and heptafluoropropane is also called HFC-227, fe-227 and FM-200, The chemical formula is c3hf7, with a melting point of 131 ℃ and a boiling point of 16.4 ℃. It is slightly soluble in water (260mg/l). It is a colorless and tasteless gas with a relative molecular weight of 170 and a density about 6 times that of air. It is stored by high-pressure liquefaction and has good thermal and chemical stability. The ozone layer depletion potential value ODP is 0 and the greenhouse effect potential value GWP is 3500, but it has a short retention time in the atmosphere.
It can be seen that heptafluoropropane is almost harmless to the environment, and heptafluoropropane will not cause any damage to documents and objects. The principle of heptafluoropropane gas fire extinguishing is mainly to inhibit the chemical chain reaction and part of the physical cooling effect, which can extinguish the solid surface fire, and has a good fire extinguishing effect on the combustible liquid fire or the fusible solid fire, and the combustible gas fire that can cut off the gas source before extinguishing. It has no pollution loss to the protected property, and is especially suitable for the protection of special items such as precision instruments, data processing centers and precious cultural relics that require fast fire extinguishing, non-conductive and non corrosive.
So, will heptafluoropropane be harmful to human body?
In China, mice, rabbits, dogs and other animals have been used to carry out experiments, and heptafluoropropane fire extinguishing agent has been comprehensively and systematically studied. The test results show that heptafluoropropane itself is low toxic or non-toxic. Later, more volunteers were willing to participate in the experiment, providing valuable human evidence. Whether animals or humans, inhalation of sevoflurane can be considered non-toxic. Among them, two important data are obtained in the test report: NOAEL and LOAEL. NOAEL is the concentration at which no adverse reactions are observed, and the animals tested at this concentration have no observable adverse reactions. LOAEL is the low concentration where adverse reactions can be observed and the low experimental concentration where adverse reactions occur. (the concentration of non-toxic reaction (NOAEL) of heptafluoropropane is 9%, and the concentration of toxic reaction (LOAEL) is 10.5%)
These evidences can reflect that heptafluoropropane has little damage to human body. However, it cannot be ignored whether heptafluoropropane will produce adverse chemical reactions after being exposed to high temperature.
To sum up, heptafluoropropane can be used in places where there are many people or people often. For example, heptafluoropropane is far less harmful to human body than car exhaust on the road, but heptafluoropropane is a gas produced by chemical agents, not flower fragrance. Try not to breathe in too much. And when the concentration exceeds 10.5%, personnel must evacuate within one minute.
