1、Designation: D6231 11Standard 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 revision. A number in par
2、entheses 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 firefighting medium.1.2 This specification does not address the firefightingequipment or
3、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
4、 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 purport to address all of
5、 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. Referenced Documents2.
6、1 ASTM Standards:2D6268 Practice for Handling, Transportation, and Storageof HFC-125, Pentafluoroethane (C2HF5)D6806 Practice for Analysis of Halogenated Organic Sol-vents and Their Admixtures by Gas Chromatography2.2 ISO Standards:ISO 3427 Gaseous Halogenated Hydrocarbons (LiquefiedGases) Taking a
7、Sample32.3 ARI Standards:2008 Appendix C Analytical Procedures for ARI Standard700-200642.4 U.S. Government Standards:Code of Federal Regulations (CFR) Title 49, Part 172.101,Tables of Hazardous Materials and Special Provisions5Code of Federal Regulations (CFR) Title 49, Part 172Subpart D, Marking R
8、equirements of Packaging forTransportation52.5 American Society of Refrigeration Engineers:ASRE Standard 34, Designation of Refrigerants63. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 halogenated hydrocarbon, nthe halogenated com-pound coding terminology system provides a con
9、venientmeans 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 number with an abbre
10、via-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 number of hydrogen
11、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 iodine, the same rule
12、s 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 Agents and is the directresponsibility of Subcommittee D26.09 on Fire Extinguishing Agents.Current edition a
13、pproved Jan. 1, 2011. Published August 2011. Originallyapproved in 1998. Last previous edition approved in 2003 as D6231-1998(2003).DOI: 10.1520/D6231-11.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMS
14、tandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute, 11 W. 42nd St., 13thFloor, New York, NY 10036.4Available from the Air Conditioning, Heating and Refrigeration Institute, 4100North Fairfax Drive, Suite
15、200, Arlington, VA, 22203-1678.5Available from Superintendent of Documents, U.S. Government PrintingOffice, Washington, DC 20036.6Available from American Society of Refrigeration Engineers, RefrigerationEngineering 65, 49 (1957).1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West
16、 Conshohocken, PA 19428-2959, United States.parent compound designated number and the number of theatoms is placed after the letter.Example: C2HF55 R2125 5 HFC2125 (1)3.1.2 HFC-125, nthe compound pentafluoroethane;C2HF5.4. Material Requirements4.1 Type I:4.1.1 The nitrogen (N2) partial pressure shal
17、l 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 filling of the container at themaximum expected storage temperature. For exampl
18、e, the U.S.DOT 4BA500 cylinder partial pressure shall not exceed 24.8bar at 21 C (360 psig at 70 F) for a 833 kg/m3(52 lb/ft3) filldensity. For this example, the safe working pressure of the4BA500 cylinder is not exceeded for temperatures below 54 C(130 F).4.1.2 HFC-125 shall conform to the requirem
19、ents 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 container, partial pressure of the nitrogen, the filldensity of the HFC-125 wi
20、thin 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 bereported in kg/m3at 21C (preferred) or lb/ft3at 70 F. Themaximum safe storage t
21、emperature 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 in 4.1 and shall contain no more than 1.5 % byvolume non-absorbable gases
22、 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 orcompounds not specified in Table 1.(WarningExposure toconcentrations of HFC-125
23、 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 liquid phase, shallbe taken from filled containers in accordance with the met
24、hodspecified 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 betested for quality conformance in accordance with Section 6.The presence of o
25、ne 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 700-200, part 1.6.3 Water ContentDetermine water content using themethod speci
26、fied in 2008 Appendix C to ARI Standard700-2006, part 2.6.4 Nonvolatile ResidueDetermine nonvolatile residueusing the method specified in 2008 Appendix C to ARIStandard 700-2006, part 3.6.5 Non-absorbable GasesDetermine non-absorbablegases using the method specified in 2008 Appendix C to ARIStandard
27、 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 failure by this test method.7. Container, Packaging, and Package Marking7.1 Cont
28、ainers 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, penta-fluoroethane, “nonflammable gas” (49 CFR 172.101). In addi-tion to DOT requ
29、irements, containers shall be marked with thefollowing 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. Keywords8.1 C2HF5; fire fighting; fire fighting agent; fire protection;fire suppre
30、ssant; HFC-125; hydrofluorocarbon; hydrofluoro-carbon 125; pentafluoroethane; FE-25yTABLE 1 RequirementsProperty RequirementHFC-125 purity, mol/mol, min, % 99.0Acidity, ppm by mass, as HCI, max 3.0Water content, ppm by mass, max 10Nonvolatile residue, max, % by weight 0.08Suspended matter or sedimen
31、t none visibleD6231 112ASTM 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 determination of the validity of any such patent rights, and the riskof infringem
32、ent of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or
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34、own 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 (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).D6231 113
