40 CFR § 721.9511 - Silicic acid (HSiOO), magnesium, strontium salt(1:1:2), dysprosium and europium-doped.

---
identifier: "/us/cfr/t40/s721.9511"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 721.9511 - Silicic acid (HSiOO), magnesium, strontium salt(1:1:2), dysprosium and europium-doped."
title_number: 40
title_name: "Protection of Environment"
section_number: "721.9511"
section_name: "Silicic acid (HSiOO), magnesium, strontium salt(1:1:2), dysprosium and europium-doped."
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: "2026-04-05"
last_updated: "2026-04-05"
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"
---


# 721.9511 Silicic acid (HSiOO), magnesium, strontium salt(1:1:2), dysprosium and europium-doped.

(a) *Chemical substance and significant new uses subject to reporting.* (1) The chemical substance identified as silicic acid (H<sub>6</sub>SiO<sub>2</sub>O<sub>7</sub>) magnesium, strontium salt(1:1:2), dysprosium and europium-doped. (PMN P-98-848; CAS No.181828-07-9) is subject to reporting under this section for the significant new use described in paragraph (a)(2) of this section.

(2) The significant new uses are:

(i) *Industrial, commercial, and consumer activities.* Requirements as specified in § 721.80(j) (manufacture or import of the chemical substance where greater than 5% of the chemical substance is below the 10 micron (respirable particles) threshold).

(ii) [Reserved]

(b) *Specific requirements.* The provisions of subpart A of this part apply to this section except as modified by this paragraph.

(1) *Recordkeeping.* Recordkeeping requirements as specified in § 721.125(a), (b), (c), and (i) are applicable to manufacturers, importers, and processors of this chemical substance.

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

[68 FR 70183, Dec. 17, 2003]