ASTM D6541-00
(Specification)Standard Specification for HFC-236fa, 1,1,1,3,3,3-Hexafluoropropane, (CF3CH2CF3)
Standard Specification for HFC-236fa, 1,1,1,3,3,3-Hexafluoropropane, (CF<sub>3</sub>CH<sub>2</sub>CF<sub>3</sub>)
SCOPE
1.1 This specification covers the requirements for HFC-236fa as a fire-fighting medium.
1.2 This specification does not address the fire-fighting equipment or hardware that employs HFC-236fa or the conditions of employing such equipment (for example, hand-helds, fixed installations, and so forth).
1.3 This specification does not address the storage or transportation of HFC-236fa. Storage, handling, and transportation issues are addressed in Practice D 6427.
The following safety hazards caveat pertains to the test methods portion, Section , 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 hazard statements are given in Note 0.
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Designation: D 6541 – 00
Standard Specification for
HFC-236fa, 1,1,1,3,3,3–Hexafluoropropane, (CF CH CF )
3 2 3
This standard is issued under the fixed designation D 6541; 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 Containers
1.1 This specification covers the requirements for HFC-
2.4 U.S. Government Standards:
236fa as a fire-fighting medium.
Code of Federal Regulations (CFR) Title 49, Part 172.101
1.2 This specification does not address the fire-fighting
Tables of Hazardous Materials and Special Provisions
equipment or hardware that employs HFC-236fa or the condi-
Code of Federal Regulations (CFR) Title 49, Part 173.302
tions of employing such equipment (for example, hand-helds,
and 173.304 Preparation and Packaging of Gases
fixed installations, and so forth).
Code of Federal Regulations (CFR) Title 49, Part 172 Sub
1.3 This specification does not address the storage or
D Marking Requirements of Packaging for Transporta-
transportation of HFC-236fa. Storage, handling, and transpor-
tion
tation issues are addressed in Practice D 6427.
2.5 American Society of Refrigeration Engineers Standard:
1.4 The following safety hazards caveat pertains to the test
ASRE Standard 34, Designation of Refrigerants
methods portion, Section 6.1, of this specification. This stan-
dard does not purport to address all of the safety concerns, if
3. Terminology
any, associated with its use. It is the responsibility of the user
3.1 Definitions of Terms Specific to This Standard:
of this standard to establish appropriate safety and health
3.1.1 halogenated hydrocarbon (see Note 1)—saturated hy-
practices and determine the applicability of regulatory limita-
drocarbons in which one or more of the hydrogen atoms have
tions prior to use. Specific hazard statements are given in Note
been replaced by atoms of the halogen series (fluorine, chlo-
2.
rine, bromine, and iodine). It is convention to prefix the
2. Referenced Documents number with an abbreviation of the compound:
2.1 ASTM Standards:
D 6427 Practice for Handling, Transportation, and Storage
CFC = chlorofluorocarbon
of HFC-236fa, 1,1,1,3,3,3–Hexafluoropropane
HCFC = hydrochlorofluorocarbon
(CF CH CF )
3 2 3 HFC = hydrofluorocarbon
2.2 ISO Standards:
FC = fluorocarbon
ISO 3363 Fluorinated Hydrocarbons for Industrial Use—
R = refrigerant
Determination of Acidity-Titration Method
NOTE 1—The halogenated compound coding terminology system pro-
ISO 3427 Gaseous Halogenated Hydrocarbons (Liquefied
vides a convenient means to reference halogenated hydrocarbons (see
Gases)—Taking a Sample
ASRE 34).
ISO 5789 Fluorinated Hydrocarbons for Industrial Use—
3.1.1.1 By definition, the right-most digit of the numbering
Determination of Nonvolatile Residue
system is the number of fluorine atoms.
2.3 CGA Standards:
3.1.1.2 The second digit from the right is the number of
No. C-4 American National Standard Method of Marking
hydrogen atoms plus one (+1).
Portable Compressed Gas Containers to Identify the
3.1.1.3 The third digit from the right is one less (-1) than the
number of carbon atoms in the compound (when this number
is zero, it is omitted from the number).
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 Halogenated Fire Extinguishants. Available from the Compressed Gas Association.
Current edition approved April 10, 2000. Published July 2000. Available from Superintendent of Documents, U.S. Government Printing
Annual Book of ASTM Standards, Vol 15.05. Office, Washington, DC 20036.
3 6
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.
D6541–00
3.1.1.4 Unaccounted for valance requirements are assumed 4.4 Unless otherwise specified, Type I is assumed.
to be chlorine atoms.
5. Sampling
3.1.1.5 When the compound contains bromine or iodine, the
5.1 Samples of HFC-236fa taken from the liquid phase,
same rules apply, except the letter B for bromine or I for iodine
shall be taken from filled containers in accordance with the
follows the parent compound designated number, and the
method specified in ISO 3427. The sampling bottle shall be
number of the atoms is placed after the letter.
capable of safely resisting the vapor pressure of the sample at
Example: CF CH CF 5 R–236fa 5 HFC–236fa
3 2 3
the highest temperature that could be encountered.
3.1.2 HFC-236fa—the compound 1,1,1,3,3,3–hexafluoro-
5.2 The HFC-236fa selected in accordance with 5.1 shall be
propane; CF CH CF .
3 2 3
tested for quality conformance in accordance with Section 6.
4. Material Requirements The presence of one or more defects shall be cause for
rejection.
4.1 Type I—Mixtures of HFC-236fa and Nitrogen:
4.1.1 The nitrogen (N ) partial pressure shall be such that
2 6. Test Methods
the safe working pressure of the receiving vessel is not
6.1 Purity:
exceeded. To prevent excessive pressure, the fill density of the
6.1.1 Determine the purity by gas chromatography in accor-
HFC-236fa/nitrogen within the container should not exceed
dance with the technique described in 6.1.2.1-6.1.5.1 or an-
that needed to achieve complete filling of the container at the
other acceptable laboratory technique providing equivalent
maximumexpectedstoragetemperature.Forexample,theU.S.
results.
DOT 4BA500 cylinder partial pressure shall not exceed 24.4
6.1.2 Apparatus—The following special apparatus is re-
3 3
bar at 21°C (340 psig at 70°F) for a 1153–kg/m (72 lb/ft ) fill
quired to determine the percent HFC-236fa.
density. For this example, the safe working pressure of the
6.1.2.1 Gas Chromatograph, equipped with a thermal con-
4BA500 cylinder is not exceeded for temperatures below 54°C
ductivity detector (TCD) and an integrator, 1–mV recorder, or
(130°F).
other output device.
4.1.2 HFC-236fa shall conform to the requirements pre-
6.1.2.2 Chromatographic Column, 6.0–ft length by ⁄8 –in.
scribed in Table 1 when tested by the appropriate test meth-
outside diameter (OD) stainless steel tubing, packed with 80 to
od(s) listed in 6.1.
100 mesh PORAPAK Q or equivalent (column is available
4.1.3 When material analysis is required, by agreement
prepacked from any chromatographic supply vendor).
betweenthepurchaserandthesupplier,thetotalpressureinthe
6.1.2.3 Gas Sampling Valve, 1–mL volume or a volume
HFC-236fa container, partial pressure of the nitrogen, the fill
sufficient to achieve proper separation and peak area for the
density of the HFC-236fa within the container, and the maxi-
specified column.
mum safe storage temperature shall be part of the material
6.1.3 Reagents:
analysis (certification). The pressure shall be reported in bar
6.1.3.1 The carrier gas shall be a chromatographic grade of
(preferred) or pound-force per square inch gage (psig). The fill
helium.
density shall be reported in kilograms per cubic metre at 21°C
6.1.3.2 The column packing shall be 80 to 100 mesh
(preferred) or pounds per cubic foot at 70°F. The maximum
PORAPAK Q or equivalent.
safe storage temperature of the HFC-236fa shall be reported in
6.1.4 Procedure:
degrees Celsius (preferred) or in degrees Fahrenheit and shall
6.1.4.1 Install the column in the gas chromatograph and set
conform to the applicable regulations for the HFC-236fa
the oven temperature to 45°C, injection port to 175°C, detector
container design and use.
block to 200°C. The oven temperature is programmed to hold
4.2 Type II—HFC-236fa shall conform to the requirements
at45°Cfor2min,thenrise10°C/min,toamaximumof150°C.
of Type I, as listed in 4.1.1, and shall contain no more than 1.5
6.1.4.2 Adjust the column helium flow to 20 mL/min.
% by volume fixed gases in the vapor phase, expressed as air
6.1.4.3 Adjust the detector voltage to the mid-range of the
when tested by the appropriate test method(s) listed in Section
thermal conductivity detector (TCD) and allow the instrument
6.1.
to equilibrate.
4.3 By agreement between the purchaser and the supplier,
6.1.4.4 Take a vapor (flashed liquid) sample from the liquid
analysis may be required and limits established for elements or
phase (inverted cylinder). Flush the sample loop and valve for
compounds not specified in Table 1.
approximately 30 s.
NOTE 2—Warning: Exposure to concentrations of HFC-236fa in ex- 6.1.4.5 Rotate the sample valve to transfer the sample into
cess of 15 % by volume in air during periods of elevated
...
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