ASTM D6231/D6231M-21

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D6231 − 11 (Reapproved 2015) D6231/D6231M − 21
Standard Specification for
HFC-125 (Pentafluoroethane, C HF )
2 5
This standard is issued under the fixed designation D6231;D6231/D6231M; the number immediately following the designation indicates
the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last
reapproval. A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This specification covers the requirements for HFC-125 as a fire-fighting medium.
1.2 This specification does not address the fire-fighting equipment or hardware that employs HFC-125 or the conditions of
employing such equipment, for example, hand helds, fixed installations, etc.
1.3 This specification does not address the storage or transportation of HFC-125. Storage, handling, and transportation issues are
addressed in Practice D6268.
1.4 The values stated in both inch-pound and either SI units or inch-pound units are to be regarded separately as the standard. The
values givenstated in parentheses are for information only.each system are not necessarily exact equivalents; therefore, to ensure
conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not
be combined.
1.5 The following safety hazards caveat pertains to the test methods portion, Section 6, of this specification. This standard does
not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard
to establish appropriate safety safety, health, and healthenvironmental practices and determine the applicability of regulatory
limitations prior to use. Specific hazards statements are given in 4.3.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
D6268 Practice for Handling, Transportation, and Storage of HFC-125, Pentafluoroethane (C HF )
2 5
D6806 Practice for Analysis of Halogenated Organic Solvents and Their Admixtures by Gas Chromatography
2.2 ISO U.S. Government Standards:
ISO 342749 CFR Part 172 Gaseous Halogenated Hydrocarbons (Liquefied Gases) – Taking a SampleHazardous Materials Table,
Special Provisions, Hazardous Materials Communications, Emergency Response Information, Training Requirements, and
Security Plans
This specification is under the jurisdiction of ASTM Committee D26 on Halogenated Organic Solvents and Fire Extinguishing Agents and is the direct responsibility
of Subcommittee D26.09 on Fire Extinguishing Agents.
Current edition approved June 1, 2015June 1, 2021. Published June 2015June 2021. Originally approved in 1998. Last previous edition approved in 20112015 as D6231-11.
-11 (2015). DOI: 10.1520/D6231-11R15.10.1520/D6231_D6231M-21.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’sstandard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D6231/D6231M − 21
49 CFR Part 172.101 Purpose and Use of Hazardous Materials Table
2.3 AHRI Standards:Standard:
2008 Appendix C for Analytical Procedures for ARIAHRI Standard 700-2006700-2014
2.4 U.S. Government Standards:
Code of Federal Regulations (CFR) Title 49, Part 172.101, Tables of Hazardous Materials and Special Provisions
Code of Federal Regulations (CFR) Title 49, Part 172 Subpart D, Marking Requirements of Packaging for Transportation
2.4 American Society of Refrigerating Engineers:ASHRAE Standard:
ASREASHRAE Standard 34,34 Designation and Safety Classification of Refrigerants
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 halogenated hydrocarbon, n—the halogenated compound coding terminology system provides a convenient means to
reference halogenated hydrocarbons (see ASRE ASHRAE Standard 34). Halogenated hydrocarbons are saturated hydrocarbons in
which one or more of the hydrogen atoms have been replaced by atoms of the halogen series: fluorine, chlorine, bromine, and
iodine. It is convention to prefix the number with an abbreviation of the compound:
CFC = chlorofluorocarbon
HCFC = hydrochlorofluorocarbon
HFC = hydrofluorocarbon
FC = fluorocarbon
R = refrigerant
3.1.1.1 Discussion—
By definition, the right–most digit of the numbering system is the number of fluorine atoms. The second digit from the right is the
number of hydrogen atoms plus one (+1). The third digit from the right is one less (-1)(–1) than number of carbon atoms in the
compound (when this number is zero (0) it is omitted from the number). Unaccounted for valance requirements are assumed to
be chlorine atoms. When the compound contains bromine or iodine, the same rules apply except the letter “B” for bromine or “I”
for iodine follows the parent compound designated number and the number of the atoms is placed after the letter.
Example:C HF 5 R-125 5 HFC-125 (1)
2 5
3.1.2 HFC-125, n—the compound pentafluoroethane; C HF .
2 5
4. Material Requirements
4.1 Type I:
4.1.1 The nitrogen (N ) partial pressure shall be such that the safe working pressure of the receiving vessel is not exceeded. To
prevent excessive pressure, the fill density of the HFC-125/nitrogen within the container should not exceed that needed to achieve
complete filling of the container at the maximum expected storage temperature. For example, the U.S. DOT Department of
Transportation (DOT) 4BA500 cylinder partial pressure shall not exceed 24.8 bar at 21°C (36021 °C [360 psig at 70°F)70 °F] for
3 3
a 833 kg/m (52[52 lb/ft )] fill density. For this example, the safe working pressure of the 4BA500 cylinder is not exceeded for
temperatures below 54°C (130°F).54 °C [130 °F].
4.1.2 HFC-125 shall conform to the requirements prescribed in Table 1 when tested by the appropriate test method(s) listed in
Section 6.
4.1.3 When material analysis is required, by agreement between the purchaser and th
...