ASTM D6126-97(2003)e1
(Specification)Standard Specification for HFC-23 (Trifluoromethane, CHF3)
Standard Specification for HFC-23 (Trifluoromethane, CHF<sub>3</sub>)
ABSTRACT
This specification covers the test methods and requirements for HFC-23 (trifluoromethane, CHF3) as a fire fighting medium. This specification, however, does not address the fire fighting equipment or hardware that employs HFC-23 or the conditions of employing such equipment (for example, handshields, fixed installations, etc.). It also does not address the storage or transportation of HFC-23. When analyzed by appropriate test methods, sampled specimens shall conform to requirements as to purity, acidity, water content, nonvolatile residue, and suspended matter or sediment.
SCOPE
1.1 This specification covers the requirements for HFC-23 as a fire fighting medium.
1.2 This specification does not address the fire fighting equipment or hardware that employs HFC-23 or the conditions of employing such equipment (for example: handshields, fixed installations, etc.).
1.3 This specification does not address the storage or transportation of HFC-23 Storage handling, and transportation issues are addressed in Practice D 6127.
1.4 The values stated in both inch-pound and SI units are to be regarded separately as the standard. The values given in parentheses are for information only.
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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: D6126 – 97 (Reapproved 2003)
Standard Specification for
HFC-23 (Trifluoromethane, CHF )
This standard is issued under the fixed designation D6126; 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.
´ NOTE—Editorial changes were made in December 2003.
1. Scope Determination of Acidity - Titration Method
ISO 3427 Gaseous Halogenated Hydrocarbons (Liquefied
1.1 This specification covers the requirements for HFC-23
Gases) - Taking a Sample
as a fire fighting medium.
ISO 5789 Fluorinated Hydrocarbons for Industrial Use -
1.2 This specification does not address the fire fighting
Determination of Nonvolatile Residue
equipment or hardware that employs HFC-23 or the conditions
2.3 CGA Standards:
of employing such equipment (for example: handshields, fixed
No. C–4, American National Standard Method of Marking
installations, etc.).
Portable Compressed Gas Containers to Identify the
1.3 This specification does not address the storage or
Material Contained
transportation of HFC-23 Storage handling, and transportation
No. P-1, Safe Handling of Compressed Gases in Contain-
issues are addressed in Practice D6127.
ers
1.4 The values stated in both inch-pound and SI units are to
2.4 U.S. Governmental Standards:
be regarded separately as the standard. The values given in
Code of Federal Regulations (CFR) Title 49, Part 172.101
parentheses are for information only.
Tables of Hazardous Materials and Special Provisions
1.5 The following safety hazards caveat pertains to the test
DOT-E 9491, Exception to Code of Federal Regulations
methods portion, Section 6, of this specification: This standard
(CFR) Title 49, Part 173.302 and Part 173.304
does not purport to address all of the safety concerns, if any,
Code of Federal Regulations (CFR) Title 49, Part 173.302
associated with its use. It is the responsibility of the user of this
and 173.304 Preparation and Packaging of Gases
standard to establish appropriate safety and health practices
Code of Federal Regulations (CFR) Title 49, Part 172 Sub
and determine the applicability of regulatory limitations prior
D Marking Requirements of Packaging for Transporta-
to use.
tion
2. Referenced Documents
2.5 American Society of Refrigeration Engineers:
ASRE Standard 34, Designation of Refrigerants
2.1 ASTM Standards:
D4081 Specification for Drycleaning-Grade Perchloroeth-
3. Terminology
ylene
3.1 Definitions of Terms Specific to This Standard:
D6127 Practice for Handling, Transportation, and Storage
3.1.1 halogenated hydrocarbon—the halogenated com-
of HFC-23 (Trifluoromethane, CHF3)
pound coding terminology system provides a convenient
2.2 ISO Standards:
means to reference halogenated hydrocarbons, ASRE 34.
ISO 3363 Fluorinated Hydrocarbons for Industrial Use -
Halogenated hydrocarbons are saturated hydrocarbons in
which one or more of the hydrogen atoms have been replaced
byatomsofthehalogenseries(fluorine,chlorine,bromine,and
This specification is under the jurisdiction of ASTM Committee D26 on
Halogenated Organic Solvents and is the direct responsibility of Subcommittee
D26.09 on Halogenated Fire Extinguishants. Available from American National Standards Institute, 11 W. 42nd St., 13th
Current edition approved May 10, 1997. Published June 1998. DOI: 10.1520/ Floor, New York, NY 10036.
D6126-97R03E01. Available from the Compressed Gas Association.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available from Superintendent of Documents, U.S. Government Printing
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Office, Washington, DC 20036.
Standards volume information, refer to the standard’s Document Summary page on Available from American Society of Refrigeration Engineers, Refrigeration
the ASTM website. Engineering 65. 49 (1957).
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D6126 – 97 (2003)
iodine). It is convention to prefix the number with an abbre- cubic metre at 21°C (preferred) or pounds per cubic foot at
viation of the compound: 70°F. The maximum safe storage temperature of the HFC-23
shall be reported in degrees Celsius (preferred) or in degrees
Fahrenheit and shall conform to the applicable regulations for
CFC = chlorofluorocarbon
the HFC-23 container design and use.
HCFC = hydrochlorofluorocarbon
4.2 By agreement between the purchaser and the supplier,
HFC = hydrofluorocarbon
analysis may be required and limits established for elements or
FC = fluorocarbon
compounds not specified in Table 1.
R = refrigerant
4.3 Product Requirements—See Table 1.
3.1.1.1 Discussion—By definitions, the right most digit of
the numbering system is the number of fluorine atoms.
5. Sampling
3.1.1.2 Discussion—The second digit from the right is the
5.1 Samples of HFC-23, taken from the liquid phase, shall
number of hydrogen atoms plus one (+1).
be taken from filled containers in accordance with the method
3.1.1.3 Discussion—The third digit from the right is one
specified in ISO 3427. The sampling bottle shall be capable of
less (-1) than number of carbon atoms in the compound (when
safely resisting the vapor pressure of the sample at the highest
this number is zero (0) it is omitted from the number.
temperature that could be encountered.
3.1.1.4 Discussion—Unaccounted for valance requirements
5.2 The HFC-23 selected in accordance with 5.1 shall be
are assumed to be chlorine atoms.
tested for quality conformance in accordance with Section 6.
3.1.1.5 Discussion—When the compound contains bromine
The presence of one or more defects shall be cause for
or iodine, the same rules apply except the letter “B” for
rejection.
bromine or “I” for iodine follows the parent compound
designated number and the number of the atoms is placed after
6. Test Methods
the letter.
6.1 Purity:
3.1.1.6 Discussion—Example—CHF = R-23 = HFC-23.
6.1.1 Determine the purity by gas chromatography in accor-
3.1.2 HFC-23 —the compound trifluoromethane; CHF .
dance with the technique described in 6.1.2-6.1.5 or another
acceptable laboratory technique providing equivalent results.
4. Material Requirements
6.1.2 Apparatus—The following special apparatus is re-
4.1 Nitrogen (N ) partial pressure is not required for this
quired to determine the percent HFC-23.
product, it is shipped neat. The saturated vapor pressure of
6.1.2.1 Gas Chromatograph, equipped with a thermal con-
HFC-23 is 42 bars at 21°C (610 psig at 70°F). HFC-23 has a
ductivity detector (TCD) and an integrator, 1-mV recorder, or
critical temperature of 25.9°C (78.6°F). The filling density
other output device.
should be that which will not liquid fill the container at
6.1.2.2 Chromatographic Column, 6.0 ft (m) length by 1/8
temperatures below 25.9°C (78.6°F) or exceed 5/4 the pressure
in. (mm) outside diameter (OD) stainless steel tubing, packed
rating of the container at 130 °F. For example, the U.S. DOT
with 80 to 100 mesh PORAPAK Q or equivalent. (Column is
3AL cylinder with a minimum working pressure of
...
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