Adjusting Imports of Polysilicon and Its Derivatives Into the United States

Proclamation 11052 of August 6, 2026 Adjusting Imports of Polysilicon and Its Derivatives Into the United States A Proclamation 1. Polysilicon is the base material underpinning the security of America's semiconductor and solar-power supply chains. Yet for decades, America has allowed foreign countries to weaken United States producers in the polysilicon sector—eroding our economic and national security. Today, I am taking action to put a stop to these practices and revitalize the United States polysilicon sector. 2. These actions are based on advice and information I received from the Secretary of Commerce (Secretary) in a report transmitted to me within the past 90 days detailing the findings of his investigation under section 232 of the Trade Expansion Act of 1962, as amended, 19 U.S.C. 1862 (section 232), into the effects of imports of polysilicon and its derivative products on the national security of the United States. After evaluating the facts considered in that investigation, and taking into account the close relation of the economic welfare of the Nation to our national security, the Secretary found and advised me of his opinion that polysilicon and its derivative products are being imported into the United States in such quantities and under such circumstances as to threaten to impair the national security of the United States. 3. Among other things, the Secretary found that polysilicon is essential to the national security and economy of the United States. Polysilicon is the base material for semiconductors, which enable all digital products and services and provide the technical foundation for the functioning of virtually every sector of the modern economy, including the defense industrial base. For example, semiconductors are critical inputs for United States defense systems, such as radar and communication systems, electronic warfare and cybersecurity systems, and guidance and control systems for missiles and drones. Without a secure and reliable…