NOTIFICATION
Addendum
The following communication, dated 18
September 2025, is being circulated at the request of the delegation of the United
States of America.
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Title: Octamethylcyclotetrasiloxane
(Cyclotetrasiloxane, 2,2,4,4,6,6,8,8-octamethyl-) (D4); Draft Risk Evaluation
Under the Toxic Substances Control Act (TSCA); Notice of Availability and
Request for Comment
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Comment period changed - date:
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Notified measure withdrawn or revoked - date:
Relevant symbol if measure re-notified:
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[X]
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Content or scope of notified measure changed and text available from1:
Notice of Availability and Request for Comment
https://members.wto.org/crnattachments/2025/TBT/USA/modification/25_06129_00_e.pdf
New deadline for comments (if applicable): 17 November 2025
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Interpretive guidance issued and text available from1:
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Description: The Environmental Protection Agency
(EPA or Agency) is announcing the availability of and seeking public comment on
a draft risk evaluation under the Toxic Substances Control Act (TSCA) for Octamethylcyclotetrasiloxane
(Cyclotetrasiloxane, 2,2,4,4,6,6,8,8- octamethyl-) (D4) (CASRN 556-67-2). The purpose of risk evaluations
under TSCA is to determine whether a chemical substance presents an
unreasonable risk of injury to health or the environment under the conditions
of use (COUs), including unreasonable risk to potentially exposed or susceptible
subpopulations identified as relevant to the risk evaluation by EPA, and
without consideration of costs or non-risk factors. EPA used the best available
science to prepare this draft risk evaluation and to preliminarily determine,
based on the weight of scientific evidence, that D4 poses unreasonable risk to
human health and the environment driven primarily by certain conditions of use
analyzed in the draft risk evaluation.
Comments must be received on or before 17 November 2025.
90 Federal Register (FR) 44821, 17 September 2025:
https://www.govinfo.gov/content/pkg/FR-2025-09-17/html/2025-17967.htm
https://www.govinfo.gov/content/pkg/FR-2025-09-17/pdf/2025-17967.pdf
This notice and a previous notice notified as G/TBT/N/USA/1775 are identified by Docket Number
EPA-HQ-OPPT-2018-0443. The Docket Folder is available on Regulations.gov at https://www.regulations.gov/docket/EPA-HQ-OPPT-2018-0443/document and provides access to primary and
supporting documents as well as comments received. Documents are also
accessible from Regulations.gov by searching the Docket Number. WTO
Members and their stakeholders are asked to submit comments to the USA TBT Enquiry Point by or before 4pm Eastern Time on 17 November 2025. Comments received
by the USA TBT Enquiry Point from WTO Members and their stakeholders will be
shared with EPA and will also be submitted to the Docket on Regulations.gov if received within
the comment period.
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[1] This information can be provided by including a website address, a
pdf attachment, or other information on where the text of the final/modified
measure and/or interpretive guidance can be obtained.