U.S. Commerce Limits Polysilicon Stockpiling Ahead of 4 December Safeguard

[ABS News Service/23.09.2026]

The Commerce Department on 22 September, 2026 issued rules limiting the amount of polysilicon and derivatives companies can stockpile in advance of new import safeguards.

In a Federal Register notice, Commerce’s Bureau of Industry and Security laid out 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.

The temporary final rule also establishes the process for 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 Customs and Border Protection on or after August 6.

The rule took effect yesterday and continues through December 3. The safeguard takes effect on December 4.

The rule establishes restrictions on all existing importers of record importing polysilicon products prior to December 4 and provides criteria specifically applicable to new IORs, registered after the signing of the Presidential proclamation announcing the import safeguard.

Commerce said it is monitoring imports of polysilicon products to identify IORs that are stockpiling in advance of December 4 and will provide CBP written notice of IORs that are importing polysilicon products in volumes substantially greater than their historic averages. CBP will notify the IOR of Commerce’s decision as well as any customs brokers conducting business on behalf of the IOR. These IORs will be prohibited from making further entries of polysilicon products into the United States prior to December 4. However, IORs subject to this restriction may apply to Commerce to waive this restriction.

To determine whether an IOR is importing polysilicon products in volumes substantially greater than its historic averages, Commerce will make a fact-specific determination based on factors, including but not limited to:

·         The aggregate volume of polysilicon products the importer has imported since Proclamation 11052 was issued on August 6;

·         The weekly average volume of polysilicon products the importer is importing since August 6;

·         The weekly average volume of polysilicon products the importer imported between January 1, and August 6;

·         The weekly average volume of polysilicon products the importer imported in 2025; and

·         The use of affiliates that do not customarily import polysilicon products, or the use of new IORs to import polysilicon products.