ASTM D6231-98(2003)
(Specification)Standard Specification for HFC-125 (Pentafluoroethane, C2HF5)
Standard Specification for HFC-125 (Pentafluoroethane, C<sub>2</sub>HF<sub>5</sub>)
ABSTRACT
This specification covers the requirements for HFC-125 (pentafluoroethane, C2HF5) as a fire-fighting medium. It does not however address the fire-fighting equipment or hardware that employs HFC-125, the conditions of employing such equipment like hand helds, fixed installations, etc., or the storage and transportation of HFC-125. Samples of HFC-125 taken in the liquid phase shall be taken from filled containers in accordance to a specific method and shall be tested for quality conformance using gas chromatography, sodium hydroxide titration, and Karl Fischer methods. HFC-125 shall conform to the purity, acidity, water content, nonvolatile residue, presence of fixed gases in the vapor phase, and suspended matter or sediment requirements when tested by the appropriate test methods.
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 D 6268.
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 4.3.
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D6231 – 98 (Reapproved 2003)
Standard Specification for
HFC-125 (Pentafluoroethane, C HF )
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This standard is issued under the fixed designation D6231; 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 No. P-1 Safe Handling of Compressed Gases in Containers
2.4 U.S. Governmental Standards:
1.1 This specification covers the requirements for HFC-125
Code of Federal Regulations (CFR) Title 49, Part 172.101,
as a fire–fighting medium.
Tables of Hazardous Materials and Special Provisions
1.2 This specification does not address the fire–fighting
Code of Federal Regulations (CFR) Title 49, Parts 173.302
equipment or hardware that employs HFC-125 or the condi-
and 173.304, Preparation and Packaging of Gases
tions of employing such equipment, for example, hand helds,
Code of Federal Regulations (CFR) Title 49, Part 172
fixed installations, etc.
Subpart D, Marking Requirements of Packaging for
1.3 This specification does not address the storage or
Transportation
transportation of HFC-125. Storage, handling, and transporta-
2.5 American Society of Refrigeration Engineers:
tion issues are addressed in Practice D D62686268.
ASRE Standard 34, Designation of Refrigerants
1.4 The following safety hazards caveat pertains to the test
methods portion, Section 6, of this specification. This standard
3. Terminology
does not purport to address all of the safety concerns, if any,
3.1 Definitions of Terms Specific to This Standard:
associated with its use. It is the responsibility of the user of this
3.1.1 halogenated hydrocarbon, n—the halogenated com-
standard to establish appropriate safety and health practices
pound coding terminology system provides a convenient
and determine the applicability of regulatory limitations prior
means to reference halogenated hydrocarbons (see ASRE 34).
to use. Specific hazards statements are given in 4.3.
Halogenated hydrocarbons are saturated hydrocarbons in
2. Referenced Documents which one or more of the hydrogen atoms have been replaced
byatomsofthehalogenseries:fluorine,chlorine,bromine,and
2.1 ASTM Standards:
iodine. It is convention to prefix the number with an abbrevia-
D6268 Practice for Handling, Transportation, and Storage
tion of the compound:
of HFC-125, Pentafluoroethane (C HF )
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2.2 ISO Standards:
ISO 3363 Fluorinated Hydrocarbons for Industrial Use –
CFC = chlorofluorocarbon
Determination of Acidity – Titration Method
HCFC = hydrochlorofluorocarbon
ISO 3427 Gaseous Halogenated Hydrocarbons (Liquefied
HFC = hydrofluorocarbon
Gases) – Taking a Sample
FC = fluorocarbon
ISO 5789 Fluorinated Hydrocarbons for Industrial Use –
R = refrigerant
Determination of Nonvolatile Residue
3.1.1.1 Discussion—By definition, the right–most digit of
2.3 CGA Standards:
the numbering system is the number of fluorine atoms. The
No. C-4 American National Standard Method of Marking
second digit from the right is the number of hydrogen atoms
Portable Compressed Gas Containers to Identify the
plusone(+1).Thethirddigitfromtherightisoneless(-1)than
Material Contained
number of carbon atoms in the compound (when this number
is zero (0) it is omitted from the number). Unaccounted for
valance requirements are assumed to be chlorine atoms. When
This specification is under the jurisdiction of ASTM Committee D26 on
thecompoundcontainsbromineoriodine,thesamerulesapply
Halogenated Organic Solvents and is the direct responsibility of Subcommittee
except the letter “B” for bromine or “I” for iodine follows the
D26.09 on Halogenated Fire Extinguishants.
parent compound designated number and the number of the
Current edition approved Feb. 10, 1998. Published July 1998. DOI: 10.1520/
atoms is placed after the letter.
D6231-98R03.
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’s Document Summary page on
the ASTM website. Available from Superintendent of Documents, U.S. Government Printing
Available from American National Standards Institute, 11 W. 42nd St., 13th Office, Washington, DC 20036.
Floor, New York, NY 10036. Available from American Society of Refrigeration Engineers, Refrigeration
Available from the Compressed Gas Association. Engineering 65, 49 (1957).
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D6231 – 98 (2003)
Example: C HF 5 R2125 5 HFC2125 (1)
5.2 The HFC-125 selected in accordance with 5.1 shall be
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tested for quality conformance in accordance with Section 6.
3.1.2 HFC-125, n—the compound pentafluoroethane;
The presence of one or more defects shall be cause for
C HF .
2 5
rejection.
4. Material Requirements
6. Test Methods
4.1 Type I:
4.1.1 The nitrogen (N ) partial pressure shall be such that 6.1 Purity:
the safe working pressure of the receiving vessel is not 6.1.1 Determine the purity by gas chromatography in accor-
exceeded. To prevent excessive pressure, the fill density of the dance with the technique described in 6.1.2-6.1.5 or another
HFC-125/nitrogen within the container should not exceed that acceptable laboratory technique providing equivalent results.
needed to achieve complete filling of the container at the 6.1.2 Apparatus—The following special apparatus is re-
maximumexpectedstoragetemperature.Forexample,theU.S. quired to determine the percent HFC-125.
DOT 4BA500 cylinder partial pressure shall not exceed 24.8 6.1.2.1 Gas Chromatograph, equipped with a thermal con-
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bar at 21° C (360 psig at 70 °F) for a 833 kg/m (52 lb/ft ) fill ductivity detector (TCD) and an integrator, 1-mV recorder, or
density. For this example, the safe working pressure of the other output device.
4BA500cylinderisnotexceededfortemperaturesbelow54°C 6.1.2.2 Chromatographic Column, 6 ft length by ⁄8-in.
(130 °F). outside diameter (OD) stainless steel tubing, packed with 80 to
4.1.2 HFC-125 shall conform to the requirements pre- 100 mesh PORAPAK Q or equivalent.
scribed in Table 1 when tested by the appropriate test meth-
NOTE 1—Column is available prepacked from any chromatographic
od(s) listed in Section 6.
supply vendor.
4.1.3 When material analysis is required, by agreement
6.1.2.3 Gas Sampling Valve, 1-mL volume or a volume
betweenthepurchaserandthesupplier,thetotalpressureinthe
sufficient to achieve proper separation and peak area for the
HFC-125 container, partial pressure of the nitrogen, the fill
specified column.
densityoftheHFC-125withinthecontainer,andthemaximum
6.1.3 Reagents—The carrier gas shall be a chromatographic
safe storage temperature shall be part of the material analysis
grade of helium. The column packing shall be 80 to 100 mesh
(certification). The pressure shall be reported in bar (preferred)
PORAPAK Q or equivalent.
or pound-force/in. gage (psig). The fill density shall be
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6.1.4 Procedure:
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.(Warning—Exposure to
30 s.
concentrations of HFC-125 in excess of 10 % by volume in air
6.1.4.5 Rotate the sample valve to transfer the sample into
during periods of elevated adrenaline could produce cardiac
the chromatograph and note the time.
arrhythmia in some personnel.)
6.1.4.6 Close the sample cylinder valve.
4.4 Unless otherwise specified, Type I is assumed.
6.1.4.7 Allow the sample to elute for approximately 15 min,
attenuating as necessary to make
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