White House Announces Tariffs on Polysilicon Imports Citing National Security

President Donald Trump signed a proclamation imposing new trade measures on imports of polysilicon and derivative products, citing national security concerns and the need to strengthen domestic supply chains. The action establishes a minimum import price program for polysilicon, imposes a 15% tariff on derivative products, and authorizes a U.S. Department of Commerce incentive program to support domestic production, with measures taking effect on December 4, 2026.