[Federal Register Volume 78, Number 66 (Friday, April 5, 2013)]
[Notices]
[Pages 20632-20637]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2013-07977]


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ENVIRONMENTAL PROTECTION AGENCY

[EPA-HQ-OAR-2009-0927; FRL-9799-4]


Mandatory Reporting of Greenhouse Gases: Notice of Data 
Availability Regarding Global Warming Potential Values for Certain 
Fluorinated Greenhouse Gases and Fluorinated Heat Transfer Fluids

AGENCY: Environmental Protection Agency (EPA).

ACTION: Notice of data availability and request for comment.

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SUMMARY: The EPA is announcing to the public the availability of 
estimated global warming potentials, as well as data and analysis 
submitted in support of them, for eight fluorinated heat transfer 
fluids. We are requesting comments on the estimated global warming 
potentials and the data and analysis supporting them. We are also 
requesting comment on the cited global warming potentials for 35 other 
fluorinated greenhouse gases and fluorinated heat transfer fluids for 
which we do not currently possess supporting data and analysis. The EPA 
is requesting comment on the global warming potentials of all 43 
chemicals as we consider adding these global warming potentials to the 
Greenhouse Gas Reporting rule.

DATES: Comments must be received on or before May 6, 2013.

ADDRESSES: Submit your comments, identified by Docket ID No. EPA-HQ-
OAR-2009-0927, by one of the following methods:

[[Page 20633]]

     Federal eRulemaking Portal: http://www.regulations.gov: 
Follow the online instructions for submitting comments.
     Email: GHGReportingFGHG@epa.gov.
     Fax: (202) 566-1741.
     Mail: EPA Docket Center, Attention Docket EPA-HQ-OAR-2009-
0927, Mail code: 2822T, 1200 Pennsylvania Avenue NW., Washington, DC 
20460.
     Hand Delivery: EPA Docket Center, Public Reading Room, 
Room 3334, EPA West Building, Attention Docket EPA-HQ-OAR-2009-0927, 
1301 Constitution Avenue NW., Washington, DC 20004. Such deliveries are 
only accepted during the Docket's normal hours of operation, and 
special arrangements should be made for deliveries of boxed 
information.
    Instructions: Direct your comments to Docket ID No. EPA-HQ-OAR-
2009-0927. The EPA's policy is that all comments received will be 
included in the public docket without change and may be made available 
online at http://www.regulations.gov, including any personal 
information provided, unless the comment includes information claimed 
to be Confidential Business Information (CBI) or other information 
whose disclosure is restricted by statute. Do not submit information 
that you consider to be CBI or otherwise protected through http://www.regulations.gov. The http://www.regulations.gov Web site is an 
``anonymous access'' system, which means EPA will not know your 
identity or contact information unless you provide it in the body of 
your comment. If you send an email comment directly to EPA without 
going through http://www.regulations.gov your email address will be 
automatically captured and included as part of the comment that is 
placed in the public docket and made available on the Internet. If you 
submit an electronic comment, the EPA recommends that you include your 
name and other contact information in the body of your comment and with 
any disk or CD-ROM you submit. If the EPA cannot read your comment due 
to technical difficulties and cannot contact you for clarification, EPA 
may not be able to consider your comment. Electronic files should avoid 
the use of special characters, any form of encryption, and be free of 
any defects or viruses.
    Docket: All documents in the docket are listed in the http://www.regulations.gov index. Although listed in the index, some 
information is not publicly available, e.g., CBI or other information 
whose disclosure is restricted by statute. Certain other material, such 
as copyrighted material, will be publicly available only in hard copy. 
Publicly available docket materials are available either electronically 
in http://www.regulations.gov or in hard copy at EPA's Docket Center, 
Public Reading Room, EPA West Building, Room 3334, 1301 Constitution 
Avenue NW., Washington, DC 20004. This Docket Facility is open from 
8:30 a.m. to 4:30 p.m., Monday through Friday, excluding legal 
holidays. The telephone number for the Public Reading Room is (202) 
566-1744, and the telephone number for the Air Docket is (202) 566-
1742.

FOR FURTHER INFORMATION CONTACT: Deborah Ottinger, Climate Change 
Division, Office of Atmospheric Programs (6207J), Environmental 
Protection Agency, 1200 Pennsylvania Avenue NW., Washington, DC 20460; 
telephone number: (202) 343-9149; fax number: (202) 343-2342; email 
address: ottinger.deborah@epa.gov.

SUPPLEMENTARY INFORMATION: 

I. General Information

A. What is today's notice about?

     The EPA is making available for public comment estimated 
GWPs for the eight fluorinated heat transfer fluids (HTFs) listed in 
Table 1 of this notice as well as data and analysis submitted in 
support of those GWPs.
     The EPA is also making available for public comment cited 
GWPs for the 35 fluorinated GHGs and fluorinated HTFs listed in Table 2 
of this notice. The EPA does not currently possess supporting data and 
analysis for these GWPs.
     Both sets of chemicals and their GWPs are being considered 
for addition to Table A-1 to subpart A of part 98, the compendium of 
GWPs used to convert tons of chemical into tons of carbon dioxide 
equivalent (CO2e) under the Greenhouse Gas Reporting 
Program.

B. How does this notice relate to the forthcoming proposed rule titled 
``2013 Revisions to the Greenhouse Gas Reporting Rule and Proposed 
Confidentiality Determinations for New or Substantially Revised Data 
Elements''?

    In the proposed rule signed March 8, 2013, titled ``2013 Revisions 
to the Greenhouse Gas Reporting Rule and Proposed Confidentiality 
Determinations for New or Substantially Revised Data Elements'' 
(hereinafter referred to as the ``2013 Technical Corrections Proposed 
Rule''), the EPA is proposing to amend subpart A, General Provisions, 
to propose GWPs for certain fluorinated greenhouse gases not currently 
listed in Table A-1 to subpart A. This notice requests comment on GWPs 
for fluorinated GHGs and fluorinated HTFs for which documented GWPs 
were not available in time for inclusion in the 2013 Technical 
Corrections Proposed Rule. The comments submitted in response to this 
notice are intended to inform a potential future rulemaking to amend 
Table A-1 to subpart A to add the GWPs of some or all of the 
fluorinated GHGs and fluorinated HTFs listed in this notice.

C. Where can I get the information?

    All of the information can be obtained through the Docket and at 
http://www.regulations.gov (see ADDRESSES section above for docket 
contact information).

D. What is the EPA taking comment on and what supporting documentation 
do I need to include in my comments?

    The EPA requests comment on topics including but not limited to the 
following:
     For the fluorinated HTFs in Table 1 of this notice, the 
reliability, including the likely accuracy and precision, of the GWPs 
listed in Table 1 given the data and analysis submitted in support of 
them, and
     The completeness, quality, and transparency of the data 
and analysis submitted in support of the GWPs in Table 1 of this 
notice.
     For the fluorinated GHGs and HTFs in Table 2 of this 
notice, the reliability, including the likely accuracy and precision, 
of the GWPs listed, and
     The accuracy of the chemical names and formulas listed.
    For the fluorinated HTFs in Table 1 of this notice, the EPA is 
specifically seeking comment on the extent to which the supporting data 
and analysis includes the following:
     Data and analysis related to the low-pressure gas phase 
infrared absorption spectrum of the fluorinated GHG.
     Data and analysis related to the estimated atmospheric 
lifetime of the fluorinated GHG (reaction mechanisms and rates, 
including e.g., photolysis and reaction with atmospheric components 
such as OH, O3, CO, and water), including descriptions of 
the measurements or modeling.
     The radiative transfer analysis that integrates the 
lifetime and infrared absorption spectrum data to calculate the GWP.
     Any published or unpublished studies of the GWP of the 
gas.
    Where quantitative structure-activity relationship (QSAR) models 
have been used, the EPA is seeking comment on the extent to which the 
data and

[[Page 20634]]

analysis include information documenting the level of accuracy of the 
QSAR-derived GWP, including:
     Information on how the structure of the ``target'' 
fluorinated GHG is similar to the structures of the fluorinated GHGs 
used to model the radiative forcing and/or reaction rate of the 
``target'' fluorinated GHG.
     Information on the quality (i.e., accuracy and precision) 
and quantity of the measurements of the radiative forcings and/or 
reaction rates of the fluorinated GHGs used to model these parameters 
for the ``target'' fluorinated GHG.
     Estimated uncertainties of the modeled forcings and/or 
reaction rates.
     Descriptions and results of any efforts to validate the 
QSAR model(s).

E. What should I consider as I prepare my comments for EPA?

     Explain your views as clearly as possible.
     Describe any assumptions that you used.
     Provide any technical information or data you used that 
support your views.
     Provide specific examples to illustrate your concerns.
     Offer alternatives.
     Make sure to submit your comments by the comment period 
deadline identified.
     To ensure proper receipt by EPA, identify the appropriate 
docket identification number in the subject line on the first page of 
your response. It would also be helpful if you provided the name, date, 
and Federal Register citation related to your comments.

F. Submitting Confidential Business Information (CBI)

    Do not submit information you are claiming as CBI to EPA through 
http://www.regulations.gov or email. Clearly mark the part of the 
information that you claim to be CBI. Information so marked will not be 
disclosed except in accordance with procedures set forth in 40 CFR part 
2. For CBI information in a disk or CD-ROM that you mail to EPA, mark 
the outside of the disk or CD-ROM as CBI and then identify 
electronically within the disk or CD-ROM the specific information that 
is claimed as CBI. In addition to one complete version of the comment 
that includes information claimed as CBI, a copy of the comment that 
does not contain the information claimed as CBI must be submitted for 
inclusion in the public docket.

II. Background

    Table A-1 to subpart A of 40 CFR part 98 (``Table A-1'') is a 
compendium of GWP values of certain GHGs that are required to be 
reported under one or more subparts of the Greenhouse Gas Reporting 
rule (``Part 98''). These GWPs are used to convert tons of chemical 
into tons of CO2-equivalent for purposes of various 
calculations and reporting under the rule. As acknowledged in the 
Federal Register notice for the final Part 98 (74 FR 56348, October 30, 
2009), it is the EPA's intent to periodically update Table A-1 as GWPs 
are evaluated or re-evaluated by the scientific community. This will 
provide a more accurate and complete account of the atmospheric impacts 
of GHG emissions and supplies.
    Table A-1 of Part 98 currently includes 10 fluorinated HTFs of 
which EPA is aware, but there are a number that it does not include. Of 
the 42 fluorinated HTFs listed in this notice (none of which is on 
Table A-1 of Part 98), electronics facilities reported emissions of 17 
under the Greenhouse Gas Reporting Program (GHGRP). Electronics 
facilities reported use of another four in a 2009 industry survey by 
the International SEMATECH Manufacturing Initiative (Technology 
Transfer 09065014A-TR). Other HTFs (those with vapor pressures 
below 1 mm Hg at 25 degrees C) may be reported for the first time this 
year because of an expanded definition of fluorinated HTF that went 
into effect in 2012. Several of the fluorinated HTFs in this notice are 
fully fluorinated. Fully fluorinated compounds are likely to have long 
atmospheric lifetimes and high GWPs.\1\
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    \1\ Fully fluorinated compounds are defined as compounds that 
contain only single bonds and in which all available valence 
locations are filled by fluorine atoms (e.g., saturated 
perfluorocarbons; fully fluorinated linear, branched and cyclic 
alkanes; fully fluorinated ethers; fully fluorinated tertiary 
amines; fully fluorinated aminoethers; and perfluoropolyethers).
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    There are two primary suppliers of fluorinated HTFs used in the 
United States: 3M Company (3M) and Solvay. After evaluating the reports 
submitted under subpart I, the EPA contacted 3M and Solvay and 
requested any data and information they had regarding the GWPs of the 
fluorinated HTFs that they supplied.
    3M responded with estimated GWPs and supporting data and analysis 
for eight fluorinated HTFs collectively composed of nine fluorinated 
compounds. (One of the HTFs, FC-77, is a blend of two fluorinated 
compounds.) For one of the fluorinated compounds, 
C8F18, the EPA is proposing a GWP in the 2013 
Technical Corrections Proposed Rule. Thus, the EPA is not requesting 
comment on the GWP of C8F18 through this action. 
However, the EPA is requesting comment on the GWPs and supporting data 
and analysis for the other eight compounds, which are listed in Table 1 
of this notice. These compounds (along with the 3M HTFs already 
included on Table A-1 of Part 98) account for most of the emissions of 
3M-supplied HTFs reported to EPA under subpart I to date (i.e., in 
2012).
    Solvay indicated that it generally did not possess data and 
analysis to support estimated GWPs for the Solvay-supplied HTFs that 
are not already on Table A-1 of Part 98.\2\ Table 2 of this notice 
therefore includes all of the Solvay-supplied fluorinated HTFs of which 
EPA is aware and which are not already included on Table A-1. It also 
includes some 3M-supplied fluorinated HTFs (and one fluorinated GHG 
used as a chamber cleaning gas) for whose estimated GWPs 3M did not 
submit supporting data and analysis. 3M indicates that some of these 
HTFs are no longer produced.
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    \2\ Solvay provided a peer-reviewed paper regarding a 
fluorinated compound, PFPMIE, that is already on Table A-1 and that 
is sold under the trade name of Galden HT 70. (There are multiple 
PFPMIEs, which have the general chemical structure 
F3C(OCFCF3CF2)m(OCF2
)nOCF3. The PFPMIE that is listed on Table A-1 
and is the primary component of HT 70 is the simplest version, with 
m=n=1.) In addition, Solvay submitted an infrared absorption 
spectrum for another fluorinated HTF that it imports into the U.S., 
Galden HT-110.
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    For several of the fluorinated HTFs (and for the fluorinated GHG) 
in Table 2 of this notice, approximate GWPs have been presented or 
published (e.g., in presentations to the EPA or in material safety data 
sheets (MSDSs)) without accompanying explanation or documentation of 
how those GWPs have been developed. For a large subset of these fully 
fluorinated chemicals, GWPs of 10,000 were identified in a presentation 
given by 3M to EPA. For some of these chemicals, different GWPs were 
identified in other sources, such as MSDSs issued by 3M or Solvay. 
These are the GWPs that are included in Table 2. The EPA does not 
intend to add the cited GWPs for these compounds to Table A-1 of Part 
98 without supporting data and analysis. We are therefore continuing to 
assemble and evaluate information regarding the GWPs for the compounds 
in Table 2 of this notice. We request comment on these GWPs and on the 
accuracy of the listed chemical names and formulas for the compounds.

III. GWP Values on Which EPA is Seeking Comment

[[Page 20635]]



                                      Table 1--F-HTFs With Documented GWPs
----------------------------------------------------------------------------------------------------------------
                                                    Chemical name and                       Source of submitted
         Trade name(s)               CAS No.             formula           Submitted GWP            GWP
----------------------------------------------------------------------------------------------------------------
Fluorinert FC-77 (component);   335-36-4........  Perfluoro-2-           9,600...........  GWP and calculation
 Fluorinert FC-75.                                 butyltetrahydro-                         methodology provided
                                                   furan.                                   by manufacturer
                                                  C8F16O...............
Fluorinert FC-3283............  338-83-0........  Perfluoro-             8,690...........  GWP and calculation
                                                   tripropylamine                           methodology provided
                                                   (PTPA).                                  by manufacturer
                                                  (C3F7)3N.............
Fluorinert FC-40..............  1064698-37-8....  Perfluoro-             9,020...........  GWP and calculation
                                                   tributylamine (PTBA).                    methodology provided
                                                  (C4F9)3N.............                     by manufacturer
Fluorinert FC-3284, PF-5052...  382-28-5........  Perfluoromethyl        9,500...........  GWP and calculation
                                                   morpholine (PMM).                        methodology provided
                                                  C5F11NO..............                     by manufacturer
Fluorinert FC-770.............  1093615-61-2....  Perfluoro-isopropyl    11,000..........  GWP and calculation
                                                   morpholine (PIPM).                       methodology provided
                                                  C7F15NO..............                     by manufacturer
Novec 7300, HFE-7300..........  132182-92-4.....  1,1,1,2,2,3,4,5,5,5-   310.............  GWP and calculation
                                                   decafluoro-3-methoxy-                    methodology provided
                                                   4-trifluoromethyl-                       by manufacturer
                                                   pentane.
                                                  CF3CF2CF(OCH3)CF(CF3)
                                                   2.
Novec 7500, HFE-7500..........  297730-93-9.....  3-ethoxy-              100.............  GWP and calculation
                                                   1,1,1,2,3,4,4,5,5,6,                     methodology provided
                                                   6,6-dodecafluoro-2-                      by manufacturer
                                                   trifluoromethyl-
                                                   hexane.
                                                  CF3CF2CF2CF(OC2H5)CF(
                                                   CF3)2.
----------------------------------------------------------------------------------------------------------------
                                  F-HTFs with Vapor Pressure Less than 1 mm Hg
----------------------------------------------------------------------------------------------------------------
Fluorinert FC-70..............  338-84-1........  Perfluoro-             8,900...........  GWP and calculation
                                                   triamylamine (PTAA).                     methodology provided
                                                  (C5F11)3N............                     by manufacturer
----------------------------------------------------------------------------------------------------------------


                    Table 2--F-GHGs and F-HTFs for whose GWPs Documentation is Not Available
----------------------------------------------------------------------------------------------------------------
                                                    Chemical name and
         Trade name(s)               CAS No.             formula             Cited GWP      Source of cited GWP
----------------------------------------------------------------------------------------------------------------
Heptafluorobutanoyl fluoride..  773-14-8........  C4F8O................  8,700...........  Identified in Pruette
                                                                                            et al. (2000) \a\
Fluorinert FC-3255, FC-104....  335-36-4........  Predominantly C5-C18.  10,000..........  Identified in
                                                                                            presentation to EPA
                                                                                            \b\
Fluorinert FC-5311,             306-91-2........  Perfluoroperhydrophen  10,000..........  Identified in
 Phenanthrene.                                     anthrene.                                presentation to EPA
                                                  C14F24...............                     \b\
Fluorinert FC-5320............  86508-42-1......  Perfluoro-compounds    >5,000..........  Identified in
                                                   C5-C18.                                  manufacturer's
                                                                                            literature \c\
Fluorinert FC-8270............  338-83-0........  Perfluoro compounds    10,000..........  Identified in
                                                   (primarily compounds                     presentation to EPA
                                                   with 9 carbons).                         \b\
Novec 7600, HFE-7600..........  870778-34-0.....  1,1,1,2,3,3-           700.............  Identified in
                                                   Hexafluoro-4-                            manufacturer's
                                                   (1,1,2,3,3,3-                            literature \d\
                                                   hexafluoroprop-oxy)-
                                                   pentane.
                                                  C8H6F12O.............
H-Galden ZT-130...............  188690-77-9.....  HCF2OCF2OCF2CF2OCF2H.  3000-5000.......  Identified in
                                                                                            presentation to EPA
                                                                                            \b\
H-Galden ZT-150...............  188690-77-9.....  HCF2OCF2OCF2CF2OCF2H.  3000-5000.......  Identified in
                                                                                            presentation to EPA
                                                                                            \b\
H-Galden ZT-180...............  188690-77-9.....  HCF2OCF2OCF2CF2OCF2H.  3000-5000.......  Identified in
                                                                                            presentation to EPA
                                                                                            \b\
H-Galden ZV60.................  Not Available...  HCF2O-(CF2O)p-         3,000-5,000.....  Identified in
                                                   (CF2CF2O)q-CF2H.                         presentation to EPA
                                                  (ratio of p/q is 2/3)                     \b\
H-Galden ZV85, ZT-85..........  Not Available...  Not Available........  3,000-5,000.....  Identified in
                                                                                            presentation to EPA
                                                                                            \b\
H-Galden ZV100................  Not Available...  Not Available........  3,000-5,000.....  Identified in
                                                                                            presentation to EPA
                                                                                            \b\
H-Galden ZV135................  Not Available...  Not Available........  3,000-5,000.....  Identified in
                                                                                            presentation to EPA
                                                                                            \b\
Galden DET....................  Not Available...  CF3(OCFCF3CF2)n-       10,000..........  Identified in
                                                   (OCF2)m-OCF3.                            presentation to EPA
                                                                                            \b\
Galden E85....................  Not Available...  CF3(OCFCF3CF2)n-       10,000..........  Identified in
                                                   (OCF2)m-OCF3.                            presentation to EPA
                                                                                            \b\
Galden HT-55..................  69991-67-9......  CF3(OCFCF3CF2)n-       10,000..........  Identified in
                                                   (OCF2)m-OCF3.                            presentation to EPA
                                                  n = 2.03 to 9.26 \h\.                     \b\
                                                  m = 0.04 to 0.19.....

[[Page 20636]]

 
Galden HT-90..................  69991-67-9......  CF3(OCFCF3CF2)n-       10,000..........  Identified in
                                                   (OCF2)m-OCF3.                            presentation to EPA
                                                  n = 2.03 to 9.26 \h\)                     \b\
                                                  m = 0.04 to 0.19.....
Galden HT-110.................  69991-67-9......  CF3(OCFCF3CF2)n-       10,000..........  Identified in
                                                   (OCF2)m-OCF3.                            presentation to EPA
                                                  n = 2.03 to 9.26 \h\.                     b,e
                                                  m = 0.04 to 0.19.....
Galden HT-135.................  69991-67-9......  CF3(OCFCF3CF2)n-       10,000..........  Identified in
                                                   (OCF2)m-OCF3.                            presentation to EPA
                                                  n = 2.03 to 9.26 \h\.                     \b\
                                                  m = 0.04 to 0.19.....
Galden HT-170.................  69991-67-9......  CF3(OCFCF3CF2)n-       10,000..........  Identified in
                                                   (OCF2)m-OCF3.                            presentation to EPA
                                                  n = 2.03 to 9.26 \h\.                     \b\
                                                  m = 0.04 to 0.19.....
Galden D02--TS................  69991-67-9......  CF3(OCFCF3CF2)n-       10,000..........  Identified in
                                                   (OCF2)m-OCF3.                            presentation to EPA
                                                                                            \b\
Galden D02--TSX...............  69991-67-9......  CF3(OCFCF3CF2)n-       None provided...  No GWP found
                                                   (OCF2)m-OCF3.
Galden PFS 2..................  69991-67-9 and    CF3(OCFCF3CF2)n-       None provided...  HTF identified in
                                 9002-84-0.        (OCF2)m-OCF3.                            distributor's
                                                                                            literature \f\
----------------------------------------------------------------------------------------------------------------
                                  F-HTFs with Vapor Pressure Less than 1 mm Hg
----------------------------------------------------------------------------------------------------------------
Fluorinert FC-43..............  311-89-7........  N(CF2CF2CF2CF3)3.....  10,000..........  Identified in
                                                                                            presentation to EPA
                                                                                            \b\
Fluorinert FC-5312............  338-84-1........  Perfluoro compounds    10,000..........  Identified in
                                                   (primarily with 15                       presentation to EPA
                                                   carbons).                                \b\
Galden D02....................  69991-67-9......  CF3(OCFCF3CF2)n-       10,000..........  Identified in
                                                   (OCF2)m-OCF3.                            presentation to EPA
                                                                                            \b\
Galden D03....................  69991-67-9......  CF3(OCFCF3CF2)n-       10,000..........  Identified in
                                                   (OCF2)m-OCF3.                            presentation to EPA
                                                                                            \b\
Galden D05....................  69991-67-9......  CF3(OCFCF3CF2)n-       10,000..........  Identified in
                                                   (OCF2)m-OCF3.                            presentation to EPA
                                                                                            \b\
Galden HS-240.................  69991-67-9......  CF3(OCFCF3CF2)n-       10,000..........  Identified in
                                                   (OCF2)m-OCF3.                            presentation to EPA
                                                  n = 6.4 to 7.3 \h\...                     \b\
                                                  m = 0.1 to 0.15......
Galden HS-260.................  69991-67-9......  CF3(OCFCF3CF2)n-       10,000..........  Identified in
                                                   (OCF2)m-OCF3.                            presentation to EPA
                                                  n = 6.4 to 7.3 \h\...                     \b\
                                                  m = 0.1 to 0.15......
Galden HT-200.................  69991-67-9......  CF3(OCFCF3CF2)n-       10,000..........  Identified in
                                                   (OCF2)m-OCF3.                            presentation to EPA
                                                  n = 2.03 to 9.26 \h\.                     \b\
                                                  m = 0.04 to 0.19.....
Galden HT-230.................  69991-67-9......  CF3(OCFCF3CF2)n-       None provided...  HTF identified in
                                                   (OCF2)m-OCF3.                            distributor's
                                                  n = 2.03 to 9.26 \h\.                     literature \g\
                                                  m = 0.04 to 0.19.....
Galden LS-200.................  69991-67-9......  CF3(OCFCF3CF2)n-       10,000..........  Identified in
                                                   (OCF2)m-OCF3.                            presentation to EPA
                                                  n = 5.2 to 6.1 \h\...                     \b\
                                                  m = 0.1 to 0.12......
Galden LS-215.................  69991-67-9......  CF3(OCFCF3CF2)n-       10,000..........  Identified in
                                                   (OCF2)m-OCF3.                            presentation to EPA
                                                  n = 5.2 to 6.1 \h\...                     \b\
                                                  m = 0.1 to 0.12......
Galden LS-230.................  69991-67-9......  CF3(OCFCF3CF2)n-       10,000..........  Identified in
                                                   (OCF2)m-OCF3.                            presentation to EPA
                                                  n = 5.2 to 6.1 \h\...                     \b\
                                                  m = 0.1 to 0.12......
----------------------------------------------------------------------------------------------------------------
\a\ Pruette, L., S. Karecki, R. Reif, L. Tousignant, W. Reagan, S. Kesari, and L. Zazzera. ``Evaulation of C4F8O
  as an Alternative Plasma-Enhanced Chemical Vapor Deposition Chamber Clean Chemistry.'' Journal of the
  Electrochemical Society, 147 (3): 1149-1153, 2000.
\b\ 3M Company. ``Greenhouse Gas Reporting of Heat Transfer Fluids.'' Presentation by Kurt Werner of 3M
  Electronics Markets Materials Division. Presented to the EPA, January 2011. Available in Docket No. EPA-HQ-OAR-
  2011-0512.
\c\ 3M Company. ``Material Safety Data Sheet: 3MTM FluorinertTM FC-5320 Electronic Liquid.'' 2012. Available
  online at: http://multimedia.3m.com/mws/mediawebserver?SSSSSuUn_zu8l00x4xtZm8m94v70k17zHvu9lxtD7SSSSSS--
\d\ 3M Company. ``Material Safety Data Sheet: 3MTM NovecTM 7600 Engineered Fluid.'' 2011. Available online at:
  http://multimedia.3m.com/mws/mediawebserver?mwsId=SSSSSuUn_zu8l00xMxmGmxtx4v70k17zHvu9lxtD7SSSSSS--.
\e\ Solvay provided an infrared (IR) spectrum for this compound, but not an estimated atmospheric lifetime or
  GWP.

[[Page 20637]]

 
\f\ http://www.sigmaaldrich.com/catalog/product/aldrich/374431?lang=en®ion=US.
\g\ https://www.lesker.com/newweb/fluids/msds/Galden_HT230.pdf.
\h\ In the chemical formulas for the Galden series, ``n'' and ``m'' indicate the number of times each group (in
  parentheses) is repeated in the compound. While ``n'' and ``m'' are integers in any single molecule, the
  Galden HTFs are typically made up of mixtures of different molecules. The values for ``n'' and ``m'' for any
  single Galden HTF represent averages for that HTF. Table 2 provides the ranges of the average values of ``n''
  and ``m'' for the Solvay HTFs in each Galden series (Galden HT, LS, etc.).

IV. Summary of EPA Assessment of Submitted GWPs and the Data and 
Analysis Supporting Them

    The EPA completed a review of the GWPs listed in Table 1 of this 
notice and the data and analysis submitted in support of them. That 
assessment is available in the docket, together with the submitted data 
and analyses. In general, we found that the data and methods used to 
estimate the GWPs were reasonable and that the GWPs were consistent 
with what would be expected for compounds of the types analyzed. 
However, there were some limitations to the data and analysis. First, 
in some cases the transparency of the data and analysis were limited 
because some of the reports containing the detailed background 
information were not available for review in time for this notice. 
Second, some of the data were of uncertain quality because they were 
based on an unpublished master's thesis. Third, because some of the 
analyses were performed in the early 1990s, some of the models used to 
estimate lifetimes or radiative efficiencies were out of date. Fourth, 
in one case (PTAA), radiative efficiency estimates were based on a 
quantitative structural activity relationship (QSAR) of uncertain 
predictive ability. Fifth, the atmospheric lifetime for one of the 
short-lived compounds (HFE-7300) was estimated based on an atmospheric 
lifetime for methane that is lower than the currently accepted 
lifetime, resulting in an underestimated lifetimes for that compound. 
Finally, for the six long-lived compounds, experimental limitations 
prevented 3M or its researchers from establishing more than minimum 
atmospheric lifetimes, and the GWPs based on these lifetimes are 
therefore also minimums.
    Overall, we do not expect that these limitations resulted in large 
errors in the resulting GWPs; and with the exception of the errors 
attributable to the last two issues (related to atmospheric lifetimes), 
we expect that these are random rather than systematic errors. To 
address the last two issues, we examined the sensitivity of the GWPs of 
the compounds to atmospheric lifetime. In general, 100-year GWPs for 
very long-lived compounds are relatively insensitive to increases in 
assumed atmospheric lifetime, and our analysis confirmed this. However, 
the 100-year GWPs for the short-lived compounds are sensitive to 
increases in the assumed atmospheric lifetime. For example, updating 
the atmospheric lifetime for HFE-7300 based on the currently accepted 
atmospheric lifetime of methane increases the estimated GWP of HFE-7300 
by 10 percent.

    Dated: April 1, 2013.
Sarah Dunham,
Director, Office of Atmospheric Programs.
[FR Doc. 2013-07977 Filed 4-4-13; 8:45 am]
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