U.S. FEDRegulation
BIS temporarily restricts polysilicon stockpiling ahead of December 4 import curbs
The Bureau of Industry and Security issued a temporary final rule implementing Proclamation 11052, which ordered curbs on polysilicon and derivative imports effective December 4, 2026. The rule set out the criteria BIS will use to monitor existing importers for stockpiling, limited newly established importers' ability to stockpile, and made stockpilers subject to restricted-import treatment. It took effect September 22, 2026, and runs through December 3, 2026.
Key points
- Rule implements Proclamation 11052 of Aug. 6, 2026, adjusting imports of polysilicon and its derivatives.Federal Register
- BIS will monitor existing companies for stockpiling using announced criteria and process before Dec. 4 adjustments.Federal Register
- Importers of record established after August 6, 2026 face weekly quantity caps, including 12 kg for HTSUS 2804.61.00 polysilicon.Federal Register
- Companies found stockpiling are barred from importing, subject to a waiver application with business justification.Federal Register
- Temporary rule at 15 CFR part 705, effective Sept. 22 through Dec. 3, 2026; published Sept. 24.Federal Register
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RegulationU.S.BIS Temporary Final Rule: Measures to Restrict Stockpiling of Polysilicon and Polysilicon Derivatives Under Proclamation 11052 (2026)ComplianceRegulatoryFor governanceFor vendors