ASTM D6126-97
(Specification)Standard Specification for HFC-23 (Trifluoromethane, CHF3)
Standard Specification for HFC-23 (Trifluoromethane, CHF<sub>3</sub>)
SCOPE
1.1 This specification covers the requirements for HFC-23 as a fire fighting medium.
General Information
Relations
Standards Content (Sample)
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 6126 – 97
Standard Specification for
HFC-23 (Trifluoromethane, CHF )
This standard is issued under the fixed designation D 6126; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope Material Contained
No. P-1, Safe Handling of Compressed Gases in Contain-
1.1 This specification covers the requirements for HFC-23
ers
as a fire fighting medium.
2.4 U.S. Governmental Standards:
1.2 This specification does not address the fire fighting
Code of Federal Regulations (CFR) Title 49, Part 172.101
equipment or hardware that employs HFC-23 or the conditions
Tables of Hazardous Materials and Special Provisions
of employing such equipment (for example: handshields, fixed
DOT-E 9491, Exception to Code of Federal Regulations
installations, etc.).
(CFR) Title 49, Part 173.302 and Part 173.304
1.3 This specification does not address the storage or
Code of Federal Regulations (CFR) Title 49, Part 173.302
transportation of HFC-23 Storage handling, and transportation
and 173.304 Preparation and Packaging of Gases
issues are addressed in Practice D 6127.
Code of Federal Regulations (CFR) Title 49, Part 172 Sub
1.4 The values stated in both inch-pound and SI units are to
D Marking Requirements of Packaging for Transporta-
be regarded separately as the standard. The values given in
tion
parentheses are for information only.
2.5 American Society of Refrigeration Engineers:
1.5 The following safety hazards caveat pertains to the test
ASRE Standard 34, Designation of Refrigerants
methods portion, Section 6, of this specification: This standard
does not purport to address all of the safety concerns, if any,
3. Terminology
associated with its use. It is the responsibility of the user of this
3.1 Definitions of Terms Specific to This Standard:
standard to establish appropriate safety and health practices
3.1.1 halogenated hydrocarbon—the halogenated com-
and determine the applicability of regulatory limitations prior
pound coding terminology system provides a convenient
to use.
means to reference halogenated hydrocarbons, ASRE 34.
2. Referenced Documents Halogenated hydrocarbons are saturated hydrocarbons in
which one or more of the hydrogen atoms have been replaced
2.1 ASTM Standards:
by atoms of the halogen series (fluorine, chlorine, bromine, and
D 4081 Specification for Dry-Cleaning Grade Perchloroet-
iodine). It is convention to prefix the number with an abbre-
hylene
viation of the compound:
D 6127 Practice for Handling, Transportation, and Storage
of HFC-23
2.2 ISO Standards:
CFC = chlorofluorocarbon
ISO 3363 Fluorinated Hydrocarbons for Industrial Use -
HCFC = hydrochlorofluorocarbon
Determination of Acidity - Titration Method
HFC = hydrofluorocarbon
ISO 3427 Gaseous Halogenated Hydrocarbons (Liquefied
FC = fluorocarbon
Gases) - Taking a Sample
R = refrigerant
ISO 5789 Fluorinated Hydrocarbons for Industrial Use -
3.1.1.1 Discussion—By definitions, the right most digit of
Determination of Nonvolatile Residue
the numbering system is the number of fluorine atoms.
2.3 CGA Standards:
3.1.1.2 Discussion—The second digit from the right is the
No. C–4, American National Standard Method of Marking
number of hydrogen atoms plus one (+1).
Portable Compressed Gas Containers to Identify the
3.1.1.3 Discussion—The third digit from the right is one
less (-1) than number of carbon atoms in the compound (when
1 this number is zero (0) it is omitted from the number.
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 the Compressed Gas Association.
Current edition approved May 10, 1997. Published June 1998.
Available from Superintendent of Documents, U.S. Government Printing
Annual Book of ASTM Standards, Vol 15.05.
Office, Washington, DC 20036.
Available from American National Standards Institute, 11 W. 42nd St., 13th
Available from American Society of Refrigeration Engineers, Refrigeration
Floor, New York, NY 10036.
Engineering 65. 49 (1957).
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
D 6126
TABLE 1 Requirements
5.2 The HFC-23 selected in accordance with 5.1 shall be
Property Requirement tested for quality conformance in accordance with Section 6.
The presence of one or more defects shall be cause for
HFC-23 purity, %, mol/mol, max 99.0
Acidity, ppm by mass, as HCI, max 3.0
rejection.
Water content, ppm by mass, max 10
Nonvolatile residue, % by weight, max 0.08
6. Test Methods
Suspended matter or sediment none visible
6.1 Purity:
6.1.1 Determine the purity by gas chromatography in accor-
3.1.1.4 Discussion—Unaccounted for valance requirements
dance with the technique described in 6.1.2-6.1.5 or another
are assumed to be chlorine atoms.
acceptable laboratory technique providing equivalent results.
3.1.1.5 Discussion—When the compound contains bromine
6.1.2 Apparatus—The following special apparatus is re-
or iodine, the same rules apply except the letter “B” for
quired to determine the percent HFC-23.
bromine or “I” for iodine follows the parent compound
6.1.2.1 Gas Chromatograph, equipped with a thermal con-
designated number and the number of the atoms is placed after
ductivity detector (TCD) and an integrator, 1-mV recorder, or
the letter.
other output device.
3.1.1.6 Discussion—Example—CHF = R-23 = HFC-23.
3 6.1.2.2 Chromatographic Column, 6.0 ft (m) length by 1/8
3.1.2 HFC-23—the compound trifluoromethane; CIIF .
3 in. (mm) outside diameter (OD) stainless steel tubing, packed
with 80 to 100 mesh PORAPAK Q or equivalent. (Column is
4. Material Requirements
available prepacked from any chromatographic supply vender).
4.1 Nitrogen (N ) partial pressure is not required for this
6.1.2.3 Gas Sampling Valve, 1 ml volume or a volume
product, it is shipped neat. The saturated vapor pressure of
sufficient to achieve proper separation and peak area for the
HFC-23 is 42 bars at 21°C (610 psig at 70°F). IIFC-23 has a
specified column.
critical temperature of 25.9°C (78.6°F). The filling density
6.1.3 Reagents:
should be that which will not liquid fill the container at
6.1.3.1 The carrier gas shall be a chromatographic grade of
temperatures below 25.9°C (78.6°F) or exceed 5/4 the pressure
Helium.
rating of the container at 130 °F. For example, the U.S. DOT
6.1.3.2 The column packing shall be 80 to 100 mesh
3AL cylinder with a minimum working pressure of 1800 psig
PORAPAK Q or equivalent.
shall not exceed 42 bar at 21°C (610 psig at 70°F) for a
6.1.4 Procedure:
maximum filling density of 84.4 %. For this example the
6.1.4.1 Install the column in the gas chromatograph and set
cylinder pressure is 141 bars at 54°C (2045 psig at 130°F).
the oven temperature to 45°C, injection port to 175°C, de
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