# Federal Register 2026-19537 — effective 2026-09-22 — Measures To Restrict Stockpiling of Polysilicon and Polysilicon Derivatives Under Proclamation 11052 — Industry and Security Bureau

For Federal Register 2026-19537, effective date is 2026-09-22; agency is Industry and Security Bureau; published is 2026-09-24; cfr parts amended is 15 CFR 705; dates, as printed is This rule is effective September 22, 2026, through December 3, 2026, recorded from its source on 2026-09-24; source re-checked 2026-11-03.

- **FR document number:** 2026-19537 _(verified: appears in the quote below)_
- **Rule:** Measures To Restrict Stockpiling of Polysilicon and Polysilicon Derivatives Under Proclamation 11052 _(verified: appears in the quote below)_
- **Agency:** Industry and Security Bureau _(verified: appears in the quote below)_
- **Effective date:** 2026-09-22 _(verified: appears in the quote below)_
- **DATES, as printed:** This rule is effective September 22, 2026, through December 3, 2026. _(verified: appears in the quote below)_
- **CFR parts amended:** 15 CFR 705 _(our reading, not quoted from the source)_
- **Published:** 2026-09-24 _(verified: appears in the quote below)_

## What the source says

> {"document_number":"2026-19537","title":"Measures To Restrict Stockpiling of Polysilicon and Polysilicon Derivatives Under Proclamation 11052","agency_names":["Commerce Department","Industry and Security Bureau"],"effective_on":"2026-09-22","dates":"This rule is effective September 22, 2026, through December 3, 2026.","cfr_references":[{"chapter":null,"citation_url":null,"part":"705","title":15}],"publication_date":"2026-09-24","html_url":"https://www.federalregister.gov/documents/2026/09/24/2026-19537/measures-to-restrict-stockpiling-of-polysilicon-and-polysilicon-derivatives-under-proclamation-11052"}

## Source

- https://www.federalregister.gov/api/v1/documents.json?per_page=1000&order=oldest&conditions%5Btype%5D%5B%5D=RULE&conditions%5Beffective_date%5D%5Bgte%5D=2026-08-31&conditions%5Beffective_date%5D%5Blte%5D=2026-12-31&fields%5B%5D=document_number&fields%5B%5D=title&fields%5B%5D=agency_names&fields%5B%5D=effective_on&fields%5B%5D=dates&fields%5B%5D=cfr_references&fields%5B%5D=publication_date&fields%5B%5D=html_url

Last verified: 2026-11-03. Review by: 2026-11-16.
Part of [Federal rules taking effect: every US final rule in the Federal Register, by effective date](https://referencesource.org/federal-rules-taking-effect/).