# 721.12047 2-Butanone, oxime, reaction products with trimethoxymethylsilane.
(a) *Chemical substance and significant new uses subject to reporting.* (1) The chemical substance identified as 2-butanone, oxime, reaction products with trimethoxymethylsilane (PMN P-21-164; CASRN 2639393-45-4) is subject to reporting under this section for the significant new uses described in paragraph (a)(2) of this section. The requirements of this section do not apply to quantities of the substance after they have been completely reacted or cured.
(2) The significant new uses are:
(i) *Protection in the workplace.* Requirements as specified in § 721.63(a)(1), (a)(3) through (6), and (c). When determining which persons are reasonably likely to be exposed as required for § 721.63(a)(1) and (4), engineering control measures (*e.g.,* enclosure or confinement of the operation, general and local ventilation) or administrative control measures (*e.g.,* workplace policies and procedures) shall be considered and implemented to prevent exposure, where feasible. For purposes of § 721.63(a)(5), respirators must provide a National Institute for Occupational Safety and Health (NIOSH) assigned protection factor (APF) of at least 50.
(ii) *Hazard communication.* Requirements as specified in § 721.72(a) through (d), (f), (g)(1), (g)(3)(iii), and (g)(5). For purposes of § 721.72(g)(1), this substance may cause: acute toxicity, carcinogenicity, serious eye damage, reproductive toxicity, skin irritation, skin sensitization, and specific target organ toxicity. Alternative hazard and warning statements that meet the criteria of the Globally Harmonized System and OSHA Hazard Communication Standard may be used.
(iii) *Industrial, commercial, and consumer activities.* It is a significant new use to load or unload the substance for manufacture, processing, or use in any manner unless under a gas (*e.g.,* nitrogen) blanket. It is a significant new use to use the substance unless at 4% or less by weight in formulation. It is a significant new use to apply the substance for use unless by roll, brush, or dip coating.
(iv) *Disposal.* Requirements as specified in § 721.85(a)(1), (b)(1), and (c)(1).
(v) *Release to water.* Requirements as specified in § 721.90(a)(1), (b)(1), and (c)(1).
(b) *Specific requirements.* The provisions of Subpart A of this part apply to this section except as modified by this paragraph (b).
(1) *Recordkeeping.* Recordkeeping requirements as specified in § 721.125(a) through (k) are applicable to manufacturers, importers, and processors of this substance.
(2) *Limitation or revocation of certain notification requirements.* The provisions of § 721.185 apply to this section.
[90 FR 33287, July 17, 2025]