1、Designation:D732721Standard Specification forHFC Blend B(CH2FCF3,CHF2CF3,and CO2)1This standard is issued under the fixed designation D7327;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parenth
2、eses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers requirements for HFC Blend Bas a fire-fighting medium.1.2 This specification does not address the fire-fightingequipment or hardwa
3、re that employs HFC Blend B or theconditions of employing such equipment(for example,handhelds,fixed installations,etc.).1.3 This specification does not address the storage ortransportation of HFC Blend B.Storage,handling,and trans-portation issues are addressed in Practice D7326.1.4 The values stat
4、ed in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard1.5 The following safety hazards caveat pertains only to thetest methods portion,Section 6,of this specifi
5、cation:Thisstandard does not purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the userof this standard to establish appropriate safety,health,andenvironmental practices and determine the applicability ofregulatory limitations prior to use.Speci
6、fic hazards statementsare given in Section 4.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the W
7、orld Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D7326 Practice for Handling,Transportation,and Storage ofHFC Blend B(CH2FCF3,CHF2CF3,and CO2)D6806 Practice for Analysis of Halogenated Organic Sol-vents and Their Admixtures by Gas Chromatogra
8、phy2.2 U.S.Government Standards:349 CFR Part 172 Hazardous Materials Table,SpecialProvisions,Hazardous Materials Communications,Emer-gency Response Information,Training Requirements andSecurity Plans49 CFR Part 172.101 Purpose and Use of Hazardous Mate-rials Table2.3 AHRI Standard:42008 Appendix C f
9、or 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 This Standard:3.1.1 HFC,nhydrofluorocarbon;a chemical compound inwhich the compound molecule is comprised
10、exclusively ofhydrogen,chlorine,fluorine and carbon atoms.3.1.2 HFC Blend B,ntertiary blend comprised of HFC-134a(1,1,1,2-tetrafluoroethane),HFC-125(pentafluoroethane),and carbon dioxide(CO2);a compoundused to inert,extinguish,or suppress a fire or explosion hazard.3.1.2.1 DiscussionThe terminology
11、system for fluorine-containing compounds(described in detail in ASHRAE Stan-dard 34)provides a convenient means to reference the structureof individual compounds.By definition,the first digit of thenumbering system represents one less than the number ofcarbon atoms in the compound molecule;the secon
12、d digit,onemore than the number of hydrogen atoms in the compoundmolecule;and the third digit,the number of fluorine atoms inthe compound molecule.Unaccounted for valence require-ments are assumed to be chlorine atoms.For example,thedesignation HFC-123 indicates two carbon atoms(1+1),two1This specif
13、ication is under the jurisdiction of ASTM Committee 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 2007.Last previous e
14、dition approved in 2017 as D7327-17.DOI:10.1520/D7327-21.2For 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
15、Federal Regulations(CFR)documents are available from U.S.Government Publishing Office(GPO),732 N.Capitol St.,NW,Washington,DC20401,http:/www.gpo.gov.4Available from Air-Conditioning,Heating,and Refrigeration Institute(AHRI),2311 Wilson Blvd.,Suite 400,Arlington,VA 22201,http:/www.ahrinet.org.5Availa
16、ble from American Society of Heating,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 internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issue
