Notice2025-05627
Superfund Tax on Chemical Substances; Request To Modify List of Taxable Substances; Notice of Filing for Isobutene-isoprene Rubber (n=99.10, m=0.90)
Primary source
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Published
April 3, 2025
Issuing agencies
Treasury DepartmentInternal Revenue Service
Abstract
This notice of filing announces that a petition has been filed requesting that isobutene-isoprene rubber ((C<INF>4</INF>H<INF>8</INF>)<INF>n</INF>- (C<INF>5</INF>H<INF>8</INF>)<INF>m</INF>; n=99.10, m=0.90) be added to the list of taxable substances. This notice of filing also requests comments on the petition. This notice of filing is not a determination that the list of taxable substances is modified.
Full Text
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<title>Federal Register, Volume 90 Issue 63 (Thursday, April 3, 2025)</title>
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[Federal Register Volume 90, Number 63 (Thursday, April 3, 2025)]
[Notices]
[Page 14689]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2025-05627]
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DEPARTMENT OF THE TREASURY
Internal Revenue Service
Superfund Tax on Chemical Substances; Request To Modify List of
Taxable Substances; Notice of Filing for Isobutene-isoprene Rubber
(n=99.10, m=0.90)
AGENCY: Internal Revenue Service (IRS), Treasury.
ACTION: Notice of filing and request for comments.
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SUMMARY: This notice of filing announces that a petition has been filed
requesting that isobutene-isoprene rubber
((C<INF>4</INF>H<INF>8</INF>)<INF>n</INF>-
(C<INF>5</INF>H<INF>8</INF>)<INF>m</INF>; n=99.10, m=0.90) be added to
the list of taxable substances. This notice of filing also requests
comments on the petition. This notice of filing is not a determination
that the list of taxable substances is modified.
DATES: Written comments and requests for a public hearing must be
received on or before June 2, 2025.
ADDRESSES: Commenters are encouraged to submit public comments or
requests for a public hearing relating to this petition electronically
via the Federal eRulemaking Portal at <a href="http://www.regulations.gov">http://www.regulations.gov</a>
(indicate public docket number IRS-2025-0024 or isobutene-isoprene
rubber ((C<INF>4</INF>H<INF>8</INF>)<INF>n</INF>-
(C<INF>5</INF>H<INF>8</INF>)<INF>m</INF>; n=99.10, m=0.90)) by
following the online instructions for submitting comments. Comments
cannot be edited or withdrawn once submitted to the Federal eRulemaking
Portal. Alternatively, comments and requests for a public hearing may
be mailed to: Internal Revenue Service, Attn: CC:PA:01:PR (Notice of
Filing for Isobutene-Isoprene Rubber
((C<INF>4</INF>H<INF>8</INF>)<INF>n</INF>-
(C<INF>5</INF>H<INF>8</INF>)<INF>m</INF>; n=99.10, m=0.90)), Room 5203,
P.O. Box 7604, Ben Franklin Station, Washington DC 20044. All comments
received are part of the public record and subject to public
disclosure. All comments received will be posted without change to
<a href="http://www.regulations.gov">www.regulations.gov</a>, including any personal information provided. You
should submit only information that you wish to make publicly
available. If a public hearing is scheduled, notice of the time and
place for the hearing will be published in the Federal Register.
FOR FURTHER INFORMATION CONTACT: Andrew Clark at (202) 317-6855 (not a
toll-free number).
SUPPLEMENTARY INFORMATION:
Request To Add Substance to the List
(a) Overview. A petition was filed pursuant to Rev. Proc. 2022-26
(2022-29 I.R.B. 90), as modified by Rev. Proc. 2023-20 (2023-15 I.R.B.
636), requesting that isobutene-isoprene rubber
((C<INF>4</INF>H<INF>8</INF>)<INF>n</INF>-
(C<INF>5</INF>H<INF>8</INF>)<INF>m</INF>; n=99.10, m=0.90) be added to
the list of taxable substances under section 4672(a) of the Internal
Revenue Code (List). The petition requesting the addition of isobutene-
isoprene rubber ((C<INF>4</INF>H<INF>8</INF>)<INF>n</INF>-
(C<INF>5</INF>H<INF>8</INF>)<INF>m</INF>; n=99.10, m=0.90) to the List
is based on weight and contains the information detailed in paragraph
(b) of this document. The information is provided for public notice and
comment pursuant to section 9 of Rev. Proc. 2022-26. The publication of
petition information in this notice of filing is not a determination
and does not constitute Treasury Department or IRS confirmation of the
accuracy of the information published.
(b) Petition Content.
(1) Substance name: Isobutene-isoprene rubber
((C<INF>4</INF>H<INF>8</INF>)<INF>n</INF>-
(C<INF>5</INF>H<INF>8</INF>)<INF>m</INF>; n=99.10, m=0.90).
(2) Petitioner: Arlanxeo USA LLC and Arlanxeo Canada Inc.,
importers and exporters of isobutene-isoprene rubber
((C<INF>4</INF>H<INF>8</INF>)<INF>n</INF>-
(C<INF>5</INF>H<INF>8</INF>)<INF>m</INF>; n=99.10, m=0.90).
(3) Proposed classification numbers:
(i) HTSUS number: 4002.31.0000.
(ii) Schedule B number: 4002.31.0000.
(iii) CAS number: 9010-85-9.
(4) Petition filing dates:
(i) Petition filing date for purposes of making a determination:
February 7, 2025.
(ii) Petition filing date for purposes of section 11.02 of Rev.
Proc. 2022-26, as modified by section 3 of Rev. Proc. 2023-20: July 1,
2022.
(5) Description from petition: Isobutene-isoprene rubber is a
synthetic rubber used primarily for its air retention, low permeability
to gas and moisture, broad damping characteristics, and heat and ozone
resistance. It is used in tire inner liners, tire inner tubes, tire
curing bladders, window sealants, damping mounts, hoses, and seals.
Isobutene-isoprene rubber is made from butylene. Taxable chemicals
constitute 98.91% of the materials used to produce this substance.
(6) Process identified in petition as predominant method of
production of substance: The predominant method of producing isobutene-
isoprene rubber is via the cationic copolymerization of butylene with
isoprene in the presence of a Friedel-Crafts catalyst at low
temperature, around -100[deg]C. The final product contains 0.7 wt% of
additives.
(7) Stoichiometric material consumption equation, based on process
identified as predominant method of production:
n C<INF>4</INF>H<INF>8</INF> (butylene) + m C<INF>5</INF>H<INF>8</INF>
(isoprene) [rarr]
(C<INF>4</INF>H<INF>8</INF>)<INF>n</INF>(C<INF>5</INF>H<INF>8</INF>)<INF>m</INF>
(isobutene-isoprene rubber)
(8) Tax rate calculated by Petitioner, based on Petitioner's
conversion factors for taxable chemicals used in production of
substance:
(i) Tax rate: $9.64 per ton.
(ii) Conversion factors: 0.99 for butylene.
(9) Public docket number: IRS-2025-0024.
Michael Beker,
Senior Counsel (Energy, Credits, and Excise Tax), IRS Office of Chief
Counsel.
[FR Doc. 2025-05627 Filed 4-2-25; 8:45 am]
BILLING CODE 4830-01-P
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