HFC-125 (ECARO-25 / FE-25 / NAF S 125) is a gaseous fire suppression agent which can be used in clean agent fire suppression systems. In addition, HFC-125 leaves no residue on valuable equipment and material after discharge.[3] It is generally used in situations where water from a fire sprinkler would damage expensive equipment, or where water-based fire protection is impractical, such as museums, banks, clean rooms and hospitals. The HFC-125 clean agent is stored in a pressurized container and introduced into the hazard as a gas. The agent is odorless, colorless, electrically non-conductive, non-corrosive, and leaves no residue. It is used in occupied enclosed areas that contain high-value assets.
HFC-125 suppresses fire by absorbing heat energy at its molecular level faster than the heat can be generated, so the fire cannot sustain itself. It also forms free radicals to chemically interfere with the chain reaction of the combustion process. This makes it a highly effective fire fighting agent that is safe for people and causes no damage to equipment.
HFC-125 is considered a Clean Agent and is therefore included in the National Fire Protection Association's 2001 - Standard for Clean Agent Fire Extinguishing Systems.
Environmental impactedit
HFC-125 measured by the Advanced Global Atmospheric Gases Experiment (AGAGE) in the lower atmosphere (troposphere) at stations around the world. Abundances are given as pollution free monthly mean mole fractions in parts-per-trillion.Atmospheric concentration of pentafluoroethane at various latitudes since year 2007.
HFC-125 is a non-ozone depleting replacement for chlorine- or bromine-containing chemicals such as Halon 1301. Due to its global warming potential (GWP) of 3500 times that of CO₂ and atmospheric lifetime of 29 years, it is included in the list of controlled substances of the Montreal Protocol.[4][5]
When introduced to the market HFC-125 was not considered safe for use in occupied spaces. The US EPA Significant New Alternative Policy (SNAP) listing reflected this. Following the introduction and acceptance of the PBPK model in the NFPA standard 2001 on Clean Agent Fire Extinguishing Systems 2004 Edition, the restriction was relaxed and now HFC-125 can be used in occupied hazards. Generally, class B (flammable liquid) hazards require concentrations that exceed the agent's no-observed-adverse-effect level (NOAEL) so extra precautions must be taken to avoid prolonged exposure to the agent.
At high temperatures, pentafluoroethane will decompose and produce hydrogen fluoride. This is observable as presence of sharp, pungent odour, which can be perceived in concentrations far below a dangerous level. Other decomposition products include carbonyl fluoride, carbon monoxide and carbon dioxide. Prior to re-entry of a room where HFC-125 system has been activated to suppress a fire, the atmosphere should be tested. An Acid Scavenging Additive added to pentafluoroethane is able to reduce the amount of hydrogen fluoride.
Brandsedit
ECARO-25 is a registered trademark of Fike Corporation. FE-25 is a registered trademark of E. I. du Pont de Nemours and Company or its affiliates. NAF S 125 (HFC-125 plus Acid Scavenging Additive) is a trademark of Safety Hi-Tech.
Referencesedit
^Kirk-Othmer Encyclopedia of Chemical Technology. Wiley. ISBN9780471238966.
^"Protection of Stratospheric Ozone: Notice 20 for Significant New Alternatives Policy Program". Federal Register Environmental Documents. Environmental Protection Agency. March 29, 2006. Archived from the original on 29 Jul 2012.
^. Fike. Archived from the original on Aug 6, 2020.
^Montreal Protocol Section 1.1. including 2016 Kigali amendment (in effect in 2019)
^P. Forster; V. Ramaswamy; P. Artaxo; T. Berntsen; R. Betts; D.W. Fahey; J. Haywood; J. Lean; D.C. Lowe; G. Myhre; J. Nganga; R. Prinn; G. Raga; M. Schulz; R. Van Dorland (2007). . In Solomon, S.; Miller, H.L.; Tignor, M.; Averyt, K.B.; Marquis, M.; Chen, Z.; Manning, M.; Qin, D. (eds.). Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge, United Kingdom and New York, NY, USA: Cambridge University Press. Archived from the original on 1 December 2016. Retrieved 9 October 2016.
. Integrated Risk Information System. United States Environmental Protection Agency. Archived from the original on Oct 26, 2012.
. Safety Hi-Tech. Archived from the original on Oct 7, 2022.
. Fike. Archived from the original on Jan 22, 2009.
. DuPont. Archived from the original on 2015-04-28.
. Sinerji Yangın ve Güvenlik Sistemleri. Archived from the original on Apr 29, 2021.
External linksedit
April 27, 2024
pentafluoroethane, fluorocarbon, with, formula, cf3chf2, currently, used, refrigerant, known, also, used, fire, suppression, agent, fire, suppression, systems, names, preferred, iupac, name, other, names, genetron, khladon, suva, freon, identifiers, number, mo. Pentafluoroethane is a fluorocarbon with the formula CF3CHF2 Pentafluoroethane is currently used as a refrigerant known as R 125 and also used as a fire suppression agent in fire suppression systems Pentafluoroethane Names Preferred IUPAC name Pentafluoroethane Other names Pentafluoroethane Genetron HFC 125 Khladon 125 Suva 125 Freon 125 Fc 125 R 125 Identifiers CAS Number 354 33 6 Y 3D model JSmol Interactive image ChemSpider 9256 N ECHA InfoCard 100 005 962 EC Number 206 557 8 PubChem CID 9633 UNII 6TQ8593LRQ Y CompTox Dashboard EPA DTXSID1024251 InChI InChI 1S C2HF5 c3 1 4 2 5 6 7 h1H NKey GTLACDSXYULKMZ UHFFFAOYSA N NInChI 1 C2HF5 c3 1 4 2 5 6 7 h1HKey GTLACDSXYULKMZ UHFFFAOYAX SMILES FC F C F F F Properties Chemical formula C2HF5 Molar mass 120 02 g mol Appearance Colourless gas Has a faint almost imperceptible odor Density 1 53 g cm3 liquid at 48 5 C 1 Melting point 103 0 C 153 4 F 170 2 K Boiling point 48 5 C 55 3 F 224 7 K Vapor pressure 1414 05 kPa at 25 C Except where otherwise noted data are given for materials in their standard state at 25 C 77 F 100 kPa N verify what is Y N Infobox references Pentafluoroethane does not deplete ozone so it has replaced earlier fluorinated chemicals that did However while it has zero ozone depletion potential it has high global warming potential reported by the United States Environmental Protection Agency EPA as 3450 times that of carbon dioxide 2 Contents 1 Refrigerant 2 Fire suppression systems 3 Environmental impact 4 Brands 5 References 6 External linksRefrigerant edit nbsp Shipping container for the gas shown in Japan Pentafluoroethane in a near azeotropic mixture with difluoromethane is known as R 410A a common replacement for various chlorofluorocarbons commonly known as Freon in new refrigerant systems Fire suppression systems editHFC 125 ECARO 25 FE 25 NAF S 125 is a gaseous fire suppression agent which can be used in clean agent fire suppression systems In addition HFC 125 leaves no residue on valuable equipment and material after discharge 3 It is generally used in situations where water from a fire sprinkler would damage expensive equipment or where water based fire protection is impractical such as museums banks clean rooms and hospitals The HFC 125 clean agent is stored in a pressurized container and introduced into the hazard as a gas The agent is odorless colorless electrically non conductive non corrosive and leaves no residue It is used in occupied enclosed areas that contain high value assets HFC 125 suppresses fire by absorbing heat energy at its molecular level faster than the heat can be generated so the fire cannot sustain itself It also forms free radicals to chemically interfere with the chain reaction of the combustion process This makes it a highly effective fire fighting agent that is safe for people and causes no damage to equipment HFC 125 is considered a Clean Agent and is therefore included in the National Fire Protection Association s 2001 Standard for Clean Agent Fire Extinguishing Systems Environmental impact edit nbsp HFC 125 measured by the Advanced Global Atmospheric Gases Experiment AGAGE in the lower atmosphere troposphere at stations around the world Abundances are given as pollution free monthly mean mole fractions in parts per trillion nbsp Atmospheric concentration of pentafluoroethane at various latitudes since year 2007 HFC 125 is a non ozone depleting replacement for chlorine or bromine containing chemicals such as Halon 1301 Due to its global warming potential GWP of 3500 times that of CO and atmospheric lifetime of 29 years it is included in the list of controlled substances of the Montreal Protocol 4 5 When introduced to the market HFC 125 was not considered safe for use in occupied spaces The US EPA Significant New Alternative Policy SNAP listing reflected this Following the introduction and acceptance of the PBPK model in the NFPA standard 2001 on Clean Agent Fire Extinguishing Systems 2004 Edition the restriction was relaxed and now HFC 125 can be used in occupied hazards Generally class B flammable liquid hazards require concentrations that exceed the agent s no observed adverse effect level NOAEL so extra precautions must be taken to avoid prolonged exposure to the agent At high temperatures pentafluoroethane will decompose and produce hydrogen fluoride This is observable as presence of sharp pungent odour which can be perceived in concentrations far below a dangerous level Other decomposition products include carbonyl fluoride carbon monoxide and carbon dioxide Prior to re entry of a room where HFC 125 system has been activated to suppress a fire the atmosphere should be tested An Acid Scavenging Additive added to pentafluoroethane is able to reduce the amount of hydrogen fluoride Brands editECARO 25 is a registered trademark of Fike Corporation FE 25 is a registered trademark of E I du Pont de Nemours and Company or its affiliates NAF S 125 HFC 125 plus Acid Scavenging Additive is a trademark of Safety Hi Tech References edit Kirk Othmer Encyclopedia of Chemical Technology Wiley ISBN 9780471238966 Protection of Stratospheric Ozone Notice 20 for Significant New Alternatives Policy Program Federal Register Environmental Documents Environmental Protection Agency March 29 2006 Archived from the original on 29 Jul 2012 ECARO 25 Clean Agent Fire Suppression HFC 125 Fike Archived from the original on Aug 6 2020 Montreal Protocol Section 1 1 including 2016 Kigali amendment in effect in 2019 P Forster V Ramaswamy P Artaxo T Berntsen R Betts D W Fahey J Haywood J Lean D C Lowe G Myhre J Nganga R Prinn G Raga M Schulz R Van Dorland 2007 Chapter 2 Changes in Atmospheric Constituents and in Radiative Forcing In Solomon S Miller H L Tignor M Averyt K B Marquis M Chen Z Manning M Qin D eds Climate Change 2007 The Physical Science Basis Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change Cambridge United Kingdom and New York NY USA Cambridge University Press Archived from the original on 1 December 2016 Retrieved 9 October 2016 Pentafluoroethane CASRN 354 33 6 Integrated Risk Information System United States Environmental Protection Agency Archived from the original on Oct 26 2012 NAF S 125 Safety Hi Tech Archived from the original on Oct 7 2022 ECARO 25 fire suppression systems Fike Archived from the original on Jan 22 2009 Protecting What Matters Most With DuPont FE 25 DuPont Archived from the original on 2015 04 28 FE25 HFC125 Extinguishing System Sinerji Yangin ve Guvenlik Sistemleri Archived from the original on Apr 29 2021 External links editSafety MSDS data Retrieved from https en wikipedia org w index php title Pentafluoroethane amp oldid 1195062787, wikipedia, wiki, book, books, library,
