§721.12196 Cysteine, cyclic alkyl, ethyl ester; alkylthio ketone (generic).

(a) Chemical substance and significant new uses subject to reporting. (1) The chemical substance identified generically as cysteine, cyclic alkyl, ethyl ester; alkylthio ketone (PMN P– 23–9) is subject to reporting under this section for the significant new uses described in paragraph (a)(2) of this section.

(2) The significant new uses are:

(i) Protection in the workplace. Requirements as specified in §721.63(a)(1), and (3), and (c). When determining which persons are reasonably likely to be exposed as required for §721.63(a)(1), 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.

(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: skin irritation (degradation product), 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 manufacture or process the substance in any manner that results in inhalation exposure to the substance. It is a significant new use to process for use or use the substance in a consumer product unless the concentration does not exceed 0.1% by weight in the consumer product.

(iv) Disposal. It is a significant new use to land apply the substance, or waste streams containing the substance, to agricultural lands.

(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.

[91 FR 31971, May 29, 2026]