1、Designation: D6231 11 (Reapproved 2015)Standard Specification forHFC-125 (Pentafluoroethane, C2HF5)1This standard is issued under the fixed designation D6231; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revisio
2、n. A number in parentheses indicates the year of last reapproval. Asuperscript 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-f
3、ightingequipment 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
4、D6268.1.4 The values stated in both inch-pound and SI units are tobe regarded separately as the standard. The values given inparentheses are for information only.1.5 The following safety hazards caveat pertains to the testmethods portion, Section 6, of this specification. This standarddoes not purpo
5、rt 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 safety and health practicesand determine the applicability of regulatory limitations priorto use. Specific hazards statements are given in 4.3.2. Re
6、ferenced Documents2.1 ASTM Standards:2D6268 Practice for Handling, Transportation, and Storage ofHFC-125, Pentafluoroethane (C2HF5)D6806 Practice for Analysis of Halogenated Organic Sol-vents and Their Admixtures by Gas Chromatography2.2 ISO Standards:3ISO 3427 Gaseous Halogenated Hydrocarbons (Liqu
7、efiedGases) Taking a Sample2.3 AHRI Standards:42008 Appendix C Analytical Procedures for ARI Standard700-20062.4 U.S. Government Standards:5Code of Federal Regulations (CFR) Title 49, Part 172.101,Tables of Hazardous Materials and Special ProvisionsCode of Federal Regulations (CFR) Title 49, Part 17
8、2Subpart D, Marking Requirements of Packaging forTransportation2.5 American Society of Refrigerating Engineers:6ASRE Standard 34, Designation of Refrigerants3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 halogenated hydrocarbon, nthe halogenated com-pound coding terminology s
9、ystem provides a convenientmeans to reference halogenated hydrocarbons (see ASRE 34).Halogenated hydrocarbons are saturated hydrocarbons inwhich one or more of the hydrogen atoms have been replacedby atoms of the halogen series: fluorine, chlorine, bromine, andiodine. It is convention to prefix the
10、number with an abbrevia-tion of the compound:CFC = chlorofluorocarbonHCFC = hydrochlorofluorocarbonHFC = hydrofluorocarbonFC = fluorocarbonR = refrigerant3.1.1.1 DiscussionBy definition, the rightmost digit ofthe numbering system is the number of fluorine atoms. Thesecond digit from the right is the
11、 number of hydrogen atomsplus one (+1). The third digit from the right is one less (-1) thannumber of carbon atoms in the compound (when this numberis zero (0) it is omitted from the number). Unaccounted forvalance requirements are assumed to be chlorine atoms. Whenthe compound contains bromine or i
12、odine, the same rules applyexcept the letter “B” for bromine or “I” for iodine follows the1This specification is under the jurisdiction of ASTM Committee D26 onHalogenated Organic Solvents and Fire Extinguishing Agentsand is the directresponsibility of Subcommittee D26.09 on Fire Extinguishing Agent
13、s.Current edition approved June 1, 2015. Published June 2015. Originallyapproved in 1998. Last previous edition approved in 2011 as D6231-11. DOI:10.1520/D6231-11R15.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual B
14、ook of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.4Available from the Air Conditioning, Heating and Refrigeration Inst
15、itute(AHRI), 2111 Wilson Blvd., Suite 500, Arlington, VA, 22201, http:/www.ahrinet.org.5Available from U.S. Government Publishing Office, 732 N. Capitol St., NW,Washington, DC 20401-0001, http:/www.gpo.gov.6Available from American Society of Refrigeration Engineers, RefrigerationEngineering 65, 49 (
16、1957).Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1parent compound designated number and the number of theatoms is placed after the letter.Example:C2HF55 R 2 125 5 HFC 2 125 (1)3.1.2 HFC-125, nthe compound pentafluoroethane;C2HF5.4
17、. Material Requirements4.1 Type I:4.1.1 The nitrogen (N2) partial pressure shall be such thatthe safe working pressure of the receiving vessel is notexceeded. To prevent excessive pressure, the fill density of theHFC-125/nitrogen within the container should not exceed thatneeded to achieve complete
18、filling of the container at themaximum expected storage temperature. For example, the U.S.DOT 4BA500 cylinder partial pressure shall not exceed 24.8bar at 21C (360 psig at 70F) for a 833 kg/m3(52 lb/ft3) filldensity. For this example, the safe working pressure of the4BA500 cylinder is not exceeded f
19、or temperatures below 54C(130F).4.1.2 HFC-125 shall conform to the requirements pre-scribed in Table 1 when tested by the appropriate test meth-od(s) listed in Section 6.4.1.3 When material analysis is required, by agreementbetween the purchaser and the supplier, the total pressure in theHFC-125 con
20、tainer, partial pressure of the nitrogen, the filldensity of the HFC-125 within the container, and the maximumsafe storage temperature shall be part of the material analysis(certification). The pressure shall be reported in bar (preferred)or pound-force/in.2gage (psig). The fill density shall berepo
21、rted in kg/m3at 21C (preferred) or lb/ft3at 70F. Themaximum safe storage temperature of the HFC-125 shall bereported in C (preferred) or in F and shall conform to theapplicable regulations for the HFC-125 container design anduse.4.2 Type IIHFC-125 shall conform to the requirements ofType I as listed
22、 in 4.1 and shall contain no more than 1.5 % byvolume non-absorbable gases in the vapor phase, expressed asair when tested by the appropriate test method(s) listed inSection 6.4.3 By agreement between the purchaser and the supplier,analysis may be required and limits established for elements orcompo
23、unds not specified in Table 1.(WarningExposure toconcentrations of HFC-125 in excess of 10 % by volume in airduring periods of elevated adrenaline could produce cardiacarrhythmia in some personnel.)4.4 Unless otherwise specified, Type I is assumed.5. Sampling5.1 Samples of HFC-125 taken from the liq
24、uid phase, shallbe taken from filled containers in accordance with the methodspecified in ISO 3427. The sampling bottle shall be capable ofsafely resisting the vapor pressure of the sample at the highesttemperature that could be encountered.5.2 The HFC-125 selected in accordance with 5.1 shall betes
25、ted for quality conformance in accordance with Section 6.The presence of one or more defects shall be cause forrejection.6. Test Methods6.1 PurityDetemine purity using the method specified inPractice D6806.6.2 AcidityDetermine acidity using the method specifiedin 2008 Appendix C to ARI Standard 700-
26、200, part 1.6.3 Water ContentDetermine water content using themethod specified in 2008 Appendix C to ARI Standard700-2006, part 2.6.4 Nonvolatile ResidueDetermine nonvolatile residue us-ing the method specified in 2008 Appendix C to ARI Standard700-2006, part 3.6.5 Non-absorbable GasesDetermine non-
27、absorbablegases using the method specified in 2008 Appendix C to ARIStandard 700-2006, part 5.6.6 Suspended Matter or SedimentWhile performing thenonvolatile residue analysis, examine visually for any sus-pended matter or sediment. Observation of any suspendedmatter or sediment shall constitute fail
28、ure by this test method.7. Container, Packaging, and Package Marking7.1 Containers used for shipping and storage of HFC-125conforming to this specification shall be marked in the accor-dance with Code of Federal Regulations (CFR) Title 49, Part172 Subpart D. The proper shipping name is UN3220,pentaf
29、luoroethane, “nonflammable gas” (49 CFR 172.101). Inaddition to DOT requirements, containers shall be marked withthe following information as a minimum:7.1.1 Suppliers name and address.7.1.2 HFC-125 (pentafluoroethane).7.1.3 Statement that material conforms to ASTM Specifica-tion D6231.8. Keywords8.
30、1 C2HF5; FE-25; fire fighting; fire fighting agent; fireprotection; fire suppressant; HFC-125; hydrofluorocarbon; hy-drofluorocarbon 125; pentafluoroethaneTABLE 1 RequirementsProperty RequirementHFC-125 purity, mol/mol, min, % 99.0Acidity, ppm by mass, as HCI, max 3.0Water content, ppm by mass, max
31、10Nonvolatile residue, max, % by weight 0.08Suspended matter or sediment none visibleD6231 11 (2015)2ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that det
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34、at your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints
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