40 CFR § 721.11379 - Lithium, isotope of mass 6.

---
identifier: "/us/cfr/t40/s721.11379"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 721.11379 - Lithium, isotope of mass 6."
title_number: 40
title_name: "Protection of Environment"
section_number: "721.11379"
section_name: "Lithium, isotope of mass 6."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "R"
subchapter_name: "TOXIC SUBSTANCES CONTROL ACT"
part_number: "721"
part_name: "SIGNIFICANT NEW USES OF CHEMICAL SUBSTANCES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "15 U.S.C. 2604, 2607, and 2625(c)."
regulatory_source: "49 FR 35018, Sept. 5, 1984, unless otherwise noted."
cfr_part: "721"
---


# 721.11379 Lithium, isotope of mass 6.

(a) *Chemical substance and significant new uses subject to reporting.* (1) The chemical substance identified as lithium, isotope of mass 6 (P-18-384, CASRN 14258-72-1) 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) *Industrial, Commercial, and consumer activities.* It is a significant new use to manufacture, process or use the chemical substance without the workplace engineering controls described in the PMN. It is a significant new use to use the chemical substance other than as a starting material for manufacture of 6-Lithium halide scintillation crystals for use in radiation detection.

(ii) *Release to water.* Requirements as specified in § 721.90(a)(4), (b)(4), and (c)(4) where N = 8.5.

(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 (c), (i), and (k) are applicable to manufacturers, importers, and processors of this substance.

(2) *Limitations or revocation of certain notification requirements.* The provisions of § 721.185 apply to this section.

(3) *Determining whether a specific use is subject to this section.* The provisions of § 721.1725(b)(1) apply to paragraph (a)(2)(i) of this section.

[85 FR 46555, Aug. 3, 2020]