ASTM D7122-21

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Designation: D7122 − 17 D7122 − 21
Standard Specification for
HCFC Blend B (CF CCl H, Ar, and CF )
3 2 4
This standard is issued under the fixed designation D7122; 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 requirements for HCFC Blend B as a fire-fighting medium.
1.2 This specification does not address the fire-fighting equipment or hardware that employs HCFC Blend B or the conditions of
employing such equipment (for example, handhelds, fixed installations, etc.).
1.3 This specification does not address the storage or transportation of HCFC Blend B. Storage, handling, and transportation issues
are addressed in Practice D7123.
1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
1.5 The following safety hazards caveat pertains only 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 4.5.
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:
D6806 Practice for Analysis of Halogenated Organic Solvents and Their Admixtures by Gas Chromatography
D7123 Practice for Handling, Transportation, and Storage of HCFC Blend B (CF CCl H, Ar, and CF )
3 2 4
2.2 ISO Standard:
ISO 3427 Gaseous Halogenated Hydrocarbons (Liquefied Gases)–Taking of a Sample
2.3 ASHRAE Standard:
ASHRAE 34 Designation and Safety Classification of Refrigerants
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 Feb. 1, 2017June 1, 2021. Published March 2017June 2021. Originally approved in 2005. Last previous edition approved in 20112017 as
D7122-11.-17. DOI: 10.1520/D7122-17.10.1520/D7122-21.
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
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D7122 − 21
2.2 U.S. Government Standard:Standards:
49 CFR Title 49,Part 172 Part 172, Subpart D, U.S. Department of Transportation (DOT), Marking Requirements of Packaging
for TransportationHazardous 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
2.3 AHRI Standard:
2008 Appendix C for Analytical Procedures for AHRI Standard 700-2014
2.4 ASHRAE Standard:
ASHRAE 34 Designation and Safety Classification of Refrigerants
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 HCFC—HCFC, n—hydrochlorofluorocarbon; a chemical compound in which the compound molecule is comprised
exclusively of hydrogen, chlorine, fluorine and carbon atoms.
3.1.2 HCFC Blend B—B, n—tertiary blend comprised primarily of HCFC-123 (2,2-dichloro-1,1,1-trifluoroethane); a compound
used to inert, extinguish, or suppress a fire or explosion hazard. The blend also contains argon and tetrafluoromethane.
3.1.2.1 Discussion—
The terminology system for fluorine-containing compounds (described in detail in ASHRAE Standard 34) provides a convenient
means to reference the structure of individual compounds. By definition, the first digit of the numbering system represents one less
than the number of carbon atoms in the compound molecule; the second digit, one more than the number of hydrogen atoms in
the compound molecule; and the third digit, the number of fluorine atoms in the compound molecule. Unaccounted for valence
requirements are assumed to be chlorine atoms. For example, the designation HCFC-123 indicates two carbon atoms (1 + 1), one
hydrogen atom (2-1), three fluorine atoms (3), and two chlorine atoms (2 atoms required based on valence requirements).
Example: CF CCl H = HCFC-123.
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4. Material Requirements
4.1 The fill density of HCFC Blend B within a container should not exceed that needed to achieve complete filling of the container
3 3
at the maximum envisaged storage temperature. For example, the fill density should not exceed 86 lb/ft (1377 kg ⁄m ) for a
3 3
maximum expected temperature of 130 °F (54 °C). Recommended fill density is 76 lb/ft (1219 kg/m ) or less.
4.2 HCFC Blend B shall conform to the requirements prescribed in Table 1 when tested by the appropriate test methods, such as
those listed in Section 6.
4.3 When a material analysis is required, by agreement between the purchaser and
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