1、Designation:D6231/D6231M21Standard Specification forHFC-125(Pentafluoroethane,C2HF5)1This standard is issued under the fixed designation D6231/D6231M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number
2、in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers the requirements for HFC-125as a fire-fighting medium.1.2 This specification does not address the fire-fightingequipment
3、 or hardware that employs HFC-125 or the condi-tions of employing such equipment,for example,hand helds,fixed installations,etc.1.3 This specification does not address the storage ortransportation of HFC-125.Storage,handling,and transporta-tion issues are addressed in Practice D6268.1.4 The values s
4、tated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system are not necessarily exact equivalents;therefore,toensure conformance with the standard,each system shall beused independently of the other,and values from the twosystems shall not be
5、 combined.1.5 The following safety hazards caveat pertains to the testmethods portion,Section 6,of this specification.This standarddoes not purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the user of thisstandard to establish appropriate safet
6、y,health,and environ-mental practices and determine the applicability of regulatorylimitations prior to use.Specific hazards statements are givenin 4.3.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decis
7、ion on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D6268 Practice for Handling,Transportation,and Storage ofHFC-125,Pentafluoroethane(C2H
8、F5)D6806 Practice for Analysis of Halogenated Organic Sol-vents and Their Admixtures by Gas Chromatography2.2 U.S.Government Standards:349 CFR Part 172 Hazardous Materials Table,SpecialProvisions,Hazardous Materials Communications,Emer-gency Response Information,Training Requirements,andSecurity Pla
9、ns49 CFR Part 172.101 Purpose and Use of Hazardous Mate-rials Table2.3 AHRI Standard:42008 Appendix C for Analytical Procedures for AHRI Stan-dard 700-20142.4 ASHRAE Standard:5ASHRAE Standard 34 Designation and Safety Classificationof Refrigerants3.Terminology3.1 Definitions of Terms Specific to Thi
10、s Standard:3.1.1 halogenated hydrocarbon,nthe halogenated com-pound coding terminology system provides a convenientmeans to reference halogenated hydrocarbons(see ASHRAEStandard 34).Halogenated hydrocarbons are saturated hydro-carbons in which one or more of the hydrogen atoms have beenreplaced by a
11、toms of the halogen series:fluorine,chlorine,bromine,and iodine.It is convention to prefix the number withan abbreviation of the compound:CFC=chlorofluorocarbonHCFC=hydrochlorofluorocarbonHFC=hydrofluorocarbonFC=fluorocarbonR=refrigerant1This specification is under the jurisdiction of ASTM Committee
12、 D26 onHalogenated Organic Solvents and Fire Extinguishing Agents and is the directresponsibility of Subcommittee D26.09 on Fire Extinguishing Agents.Current edition approved June 1,2021.Published June 2021.Originallyapproved in 1998.Last previous edition approved in 2015 as D6231-11(2015).DOI:10.15
13、20/D6231_D6231M-21.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Code of Federal Regulations(CFR)documents avai
14、lable from U.S.Govern-ment Publishing Office(GPO),732 N.Capitol St.,NW,Washington,DC 20401,http:/www.gpo.gov.4Available from the Air-Conditioning,Heating,and Refrigeration Institute(AHRI),2311 Wilson Blvd.,Suite 400,Arlington,VA,22201,http:/www.ahrinet.org.5Available from American Society of Heating
15、,Refrigerating,and Air-Conditioning Engineers,Inc.(ASHRAE),1791 Tullie Circle,NE,Atlanta,GA30329,http:/www.ashrae.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with international
16、ly recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.13.1.1.1 DiscussionBy definition,the rightmost digit ofthe numbering system is the number of fluorine atoms.Thesecond digit from the right is the number of hydrogen atomsplus one(+1).The third digit from the right is one less(1)than number of carbon atoms in t
