ASTM D6541-21

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of the standard as published by ASTM is to be considered the official document.
Designation: D6541 − 11 (Reapproved 2015) D6541 − 21
Standard Specification for
HFC-236fa, 1,1,1,3,3,3–Hexafluoropropane, (CF CH CF )
3 2 3
This standard is issued under the fixed designation D6541; 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-236fa as a fire-fighting medium.
1.2 This specification does not address the fire-fighting equipment or hardware that employs HFC-236fa or the conditions of
employing such equipment (for example, hand-helds, fixed installations, and so forth).
1.3 This specification does not address the storage or transportation of HFC-236fa. Storage, handling, and transportation issues
are addressed in Practice D6065D6427.
1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.after SI
units are provided for information only and are not considered standard.
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. A specific warning statement is 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:
D6065D6427 Practice for Handling, Transportation, and Storage of HFC-227ea 1,1,1,2,3,3,3-HeptafluoropropaneHFC-236fa,
1,1,1,3,3,3-Hexafluoropropane (CF CHFCFCH CF )
3 2 3
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
49 CFR Part 172.101 Purpose and Use of Hazardous Materials Table
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 2000. Last previous edition approved in 20112015 as
D6541–11. –11 (2015). DOI: 10.1520/D6541-11R15.10.1520/D6541-21.
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
D6541 − 21
2.3 AHRI Standard:
2008 Appendix C for Analytical Procedures for AHRI 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 ASHRAE Standard:
ASHRAE Standard 34 Designation and Safety Classification of Refrigerants
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 halogenated hydrocarbon hydrocarbon, n (see Note 1Discussion)—)—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
NOTE 1—The halogenated compound coding terminology system provides a convenient means to reference halogenated hydrocarbons (see ASRE 34).
Discussion—The halogenated compound coding terminology system provides a convenient means to reference halogenated
hydrocarbons (see ASHRAE 34).
3.1.1.1 By definition, the right-most digit of the numbering system is the number of fluorine atoms.
3.1.1.2 The second digit from the right is the number of hydrogen atoms plus one (+1).
3.1.1.3 The third digit from the right is one less (-1)(–1) than the number of carbon atoms in the compound (when this number
is zero, it is omitted from the number).
3.1.1.4 Unaccounted for valance requirements are assumed to be chlorine atoms.
3.1.1.5 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: CF CH CF 5R-236fa5HFC-236fa
3 2 3
3.1.2 HFC-236fa—HFC-236fa, n—the compound 1,1,1,3,3,3–hexafluoropropane; CF CH CF .
3 2 3
4. Material Requirements
4.1 Type I—Mixtures of HFC-236fa and Nitrogen:
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-236fa/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 24.4 bar 24.4 bar at 21°C21 °C (340 psig at 70°F)70 °F)
3 3
for a 1153–kg/m1153 kg/m (72 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).
Available from Air-Conditioning, Heating, &and Refrigeration Institute (AHRI), 21112311 Wilson Blvd., Suite 500,400, Arlington, VA 22201, http://www.ahrinet.org.
Available from American Nati
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