ASTM D6231-98
(Specification)Standard Specification for HFC-125 (Pentafluoroethane, C2HF5)
Standard Specification for HFC-125 (Pentafluoroethane, C<sub>2</sub>HF<sub>5</sub>)
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 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. Specific hazards statements are given in Note 1.
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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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.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 6231 – 98
Standard Specification for
HFC-125 (Pentafluoroethane, C HF )
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This standard is issued under the fixed designation D 6231; 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 Tables of Hazardous Materials and Special Provisions
Code of Federal Regulations (CFR) Title 49, Parts 173.302
1.1 This specification covers the requirements for HFC-125
and 173.304, Preparation and Packaging of Gases
as a fire–fighting medium.
Code of Federal Regulations (CFR) Title 49, Part 172
1.2 This specification does not address the fire–fighting
Subpart D, Marking Requirements of Packaging for
equipment or hardware that employs HFC-125 or the condi-
Transportation
tions of employing such equipment, for example, hand helds,
2.5 American Society of Refrigeration Engineers:
fixed installations, etc.
ASRE Standard 34, Designation of Refrigerants
1.3 This specification does not address the storage or
transportation of HFC-125. Storage, handling, and transporta-
3. Terminology
tion issues are addressed in Practice D 6268.
3.1 Definitions of Terms Specific to This Standard:
1.4 The following safety hazards caveat pertains to the test
3.1.1 halogenated hydrocarbon, n—the halogenated com-
methods portion, Section 6, of this specification. This standard
pound coding terminology system provides a convenient
does not purport to address all of the safety concerns, if any,
means to reference halogenated hydrocarbons (see ASRE 34).
associated with its use. It is the responsibility of the user of this
Halogenated hydrocarbons are saturated hydrocarbons in
standard to establish appropriate safety and health practices
which one or more of the hydrogen atoms have been replaced
and determine the applicability of regulatory limitations prior
by atoms of the halogen series: fluorine, chlorine, bromine, and
to use. Specific hazards statements are given in Note 1.
iodine. It is convention to prefix the number with an abbrevia-
2. Referenced Documents tion of the compound:
2.1 ASTM Standards:
D 6268 Practice for Handling, Transportation, and Storage
CFC = chlorofluorocarbon
of HFC-125, Pentafluoroethane (C HF )
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HCFC = hydrochlorofluorocarbon
2.2 ISO Standards:
HFC = hydrofluorocarbon
ISO 3363 Fluorinated Hydrocarbons for Industrial Use –
FC = fluorocarbon
Determination of Acidity – Titration Method
R = refrigerant
ISO 3427 Gaseous Halogenated Hydrocarbons (Liquefied
3.1.1.1 Discussion—By definition, the right–most digit of
Gases) – Taking a Sample
the numbering system is the number of fluorine atoms. The
ISO 5789 Fluorinated Hydrocarbons for Industrial Use –
second digit from the right is the number of hydrogen atoms
Determination of Nonvolatile Residue
plus one (+1). The third digit from the right is one less (-1) than
2.3 CGA Standards:
number of carbon atoms in the compound (when this number
No. C-4 American National Standard Method of Marking
is zero (0) it is omitted from the number). Unaccounted for
Portable Compressed Gas Containers to Identify the
valance requirements are assumed to be chlorine atoms. When
Material Contained
the compound contains bromine or iodine, the same rules apply
No. P-1 Safe Handling of Compressed Gases in Containers
except the letter “B” for bromine or “I” for iodine follows the
2.4 U.S. Governmental Standards:
parent compound designated number and the number of the
Code of Federal Regulations (CFR) Title 49, Part 172.101,
atoms is placed after the letter.
Example: C HF 5 R2125 5 HFC2125 (1)
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This specification is under the jurisdiction of ASTM Committee D26 on
3.1.2 HFC-125, n—the compound pentafluoroethane;
Halogenated Organic Solvents and is the direct responsibility of Subcommittee
C HF .
D26.09 on Halogenated Fire Extinguishants.
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Current edition approved Feb. 10, 1998. Published July 1998.
Annual Book of ASTM Standards, Vol. 15.05.
Available from American National Standards Institute, 11 W. 42nd St., 13th
Available from Superintendent of Documents, U.S. Government Printing
Floor, New York, NY 10036.
Office, Washington, DC 20036.
Available from the Compressed Gas Association.
Available from American Society of Refrigeration Engineers, Refrigeration
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 6231
4. Material Requirements 6. Test Methods
4.1 Type I:
6.1 Purity:
4.1.1 The nitrogen (N ) partial pressure shall be such that
6.1.1 Determine the purity by gas chromatography in accor-
the safe working pressure of the receiving vessel is not
dance with the technique described in 6.1.2-6.1.5 or another
exceeded. To prevent excessive pressure, the fill density of the acceptable laboratory technique providing equivalent results.
HFC-125/nitrogen within the container should not exceed that
6.1.2 Apparatus—The following special apparatus is re-
needed to achieve complete filling of the container at the
quired to determine the percent HFC-125.
maximum expected storage temperature. For example, the U.S.
6.1.2.1 Gas Chromatograph, equipped with a thermal con-
DOT 4BA500 cylinder partial pressure shall not exceed 24.8
ductivity detector (TCD) and an integrator, 1-mV recorder, or
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bar at 21° C (360 psig at 70 °F) for a 833 kg/m (52 lb/ft ) fill
other output device.
density. For this example, the safe working pressure of the
6.1.2.2 Chromatographic Column, 6 ft length by ⁄8-in.
4BA500 cylinder is not exceeded for temperatures below 54 °C
outside diameter (OD) stainless steel tubing, packed with 80 to
(130 °F).
100 mesh PORAPAK Q or equivalent.
4.1.2 HFC-125 shall conform to the requirements pre-
NOTE 2—Column is available prepacked from any chromatographic
scribed in Table 1 when tested by the appropriate test meth-
supply vendor.
od(s) listed in Section 6.
6.1.2.3 Gas Sampling Valve, 1-mL volume or a volume
4.1.3 When material analysis is required, by agreement
sufficient to achieve proper separation and peak area for the
between the purchaser and the supplier, the total pressure in the
specified column.
HFC-125 container, partial pressure of the nitrogen, the fill
6.1.3 Reagents—The carrier gas shall be a chromatographic
density of the HFC-125 within the container, and the maximum
safe storage temperature shall be part of the material analysis grade of helium. The column packing shall be 80 to 100 mesh
PORAPAK Q or equivalent.
(certification). The pressure shall be reported in bar (preferred)
or pound-force/in. gage (psig). The fill density shall be 6.1.4 Procedure:
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reported in kg/m at 21°C (preferred) or lb/ft at 70 °F. The 6.1.4.1 Install the column in the gas chromatograph and set
maximum safe storage temperature of the HFC-125 shall be
the oven temperature to 45 °C, injection port to 175 °C,
reported in °C (preferred) or in °F and shall conform to the detector clock to 200 °C. The oven temperature is programmed
applicable regulations for the HFC-125 container design and
to hold at 45 °C for 2 min, then to rise 10 °C/min, to a
use. maximum of 150 °C.
4.2 Type II—HFC-125 shall conform to the requirements of
6.1.4.2 Adjust the column helium flow to 20 mL/min.
Type I as listed in 4.1 and shall contain no more than 1.5 % by
6.1.4.3 Adjust the detector voltage to the mid-range of the
volume fixed gases in the vapor phase, expressed as air when
thermal conductivity detector (TCD) and allow the instrument
tested by the appropriate test method(s) listed in Section 6.
to equilibrate.
4.3 By agreement between the purchaser and the supplier,
6.1.4.4 Take a vapor sample from the liquid phase (inverted
analysis may be required and limits established for elements or
cylinder). Flush the sample loop and valve for approximately
compounds not specified in Table 1.
30 s.
6.1.4.5 Rotate the sample valve to transfer the sample into
NOTE 1—Warning: Exposure to concentrations of HFC-125 in excess
the chromatograph and note the time.
of 7.5 % by volume in air during periods of elevated adrenaline could
produce cardiac arrhythmia in some personnel. 6.1.4.6 Close the sample cylinder valve.
6.1.4.7 Allow the sample to elute for approximately 15 min,
4.4 Unless otherwise specified, Type I is assumed.
attenuating as necessary to make the peak height a convenient
5. Sampling
size. Under proper instrument settings, air (N ,O ) should
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elute after about 0.4 min and HFC-125 should elute after
5.1 Samples of HFC-125 taken from the liquid phase, shall
approximately 5.7 min.
be taken from filled containers in accordance with the method
6.1.5 Calculation:
specified in ISO 3427. The sampling bottle shall b
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