# 2026-19537: US Slaps Stockpiling Limits on Solar Chip Material Polysilicon

2026-19537, Measures To Restrict Stockpiling of Polysilicon and Polysilicon Derivatives Under Proclamation 11052, is a Federal Register rule from Commerce Department, Industry and Security Bureau published 2026-09-24, effective 2026-09-22; PRIA reads it as touching household money (as of 2026-10-01).

- Canonical: https://policyrisk.com/federal-register/2026-19537
- As of: 2026-10-01
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Document number: 2026-19537
- Title: Measures To Restrict Stockpiling of Polysilicon and Polysilicon Derivatives Under Proclamation 11052
- Type: Rule
- Agencies: Commerce Department; Industry and Security Bureau
- Citation: 91 FR 60505
- Published: 2026-09-24
- Effective: 2026-09-22
- Comments close: not stated
- Significant: no
- Touches household money: yes
- Regulation identifier numbers: 0694-AK57
- Last updated: 2026-10-01

## In one line

US Slaps Stockpiling Limits on Solar Chip Material Polysilicon

## Summary

Starting September 22, 2026, the U.S. is cracking down on companies hoarding polysilicon and its derivatives before new import rules kick in on December 4, 2026. If a company is caught stockpiling, they could face import bans unless they get a special waiver. New importers registering after August 6, 2026, will also face limits to keep things fair and steady.

## Abstract

On August 6, 2026, the President issued Proclamation 11052, "Adjusting Imports of Polysilicon and Its Derivatives Into the United States" (Proclamation 11052), ordering the Secretary of Commerce (Secretary) to take action to restrict imports by a company if he determines the company is stockpiling polysilicon or polysilicon derivatives (Polysilicon Products) in advance of import adjustments that will be effective on December 4, 2026. The Bureau of Industry and Security (BIS), in this temporary final rule (TFR), announces the criteria and process it will use to monitor existing companies for evidence of stockpiling, limit a newly established importer's ability to stockpile, and subject companies that are stockpiling to an import prohibition if necessary. This TFR also establishes the process for such companies to obtain a waiver from any import prohibitions imposed pursuant to this rule, and imposes certain import limitations on new importers that register with U.S. Customs and Border Protection (CBP) on or after August 6, 2026.

## Effects PRIA read

- Existing importers monitored and banned: cost, medium. If you are an importer of record (IOR) that imported polysilicon or its derivatives, Commerce will watch your shipments and compare them to your historic averages. If Commerce finds you are importing volumes substantially greater than your historic averages (using factors such as aggregate volume s…
- Weekly import caps for new importers: cost, medium. If you became an importer of record (IOR) on or after August 6, 2026, you are limited to small weekly quantities of certain Harmonized Tariff Schedule (HTSUS) items before December 4, 2026: HTSUS 2804.61.00 — 12 kg per week; HTSUS 3818.00.0020, 3818.00.0040, 3818.00.0045, 3818.00.0050, and 3818.00.…
- Waiver application window and requirements: benefit, medium. If you are prohibited or limited from importing polysilicon products, you may apply for a waiver from September 22, 2026 through December 3, 2026 by submitting a PDF application to the BIS waiver inbox at [email protected]. Applications must be up to 30 pages, include organization information, HTS…
- Customs brokers face enforcement risk: cost, medium. If you are a customs broker entering polysilicon products between September 22, 2026 and December 4, 2026, you must not file or assist with filings you know are false and must consider factors (such as whether an IOR was established on or after August 6, 2026) to avoid facilitating stockpiling. Bro…

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## Sources
- [2026-19537 on federalregister.gov](https://www.federalregister.gov/documents/2026/09/24/2026-19537/measures-to-restrict-stockpiling-of-polysilicon-and-polysilicon-derivatives-under-proclamation-11052)
- [2026-19537 as published (PDF)](https://www.govinfo.gov/content/pkg/FR-2026-09-24/pdf/2026-19537.pdf)

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Source: PRIA, https://policyrisk.com/federal-register/2026-19537 (as of 2026-10-01).