Washington: Polysilicon, a critical component for the semiconductor and solar-power industries in the United States, is now the focus of new import regulations aimed at revitalizing domestic production and safeguarding national security. President Donald J. Trump has announced a series of measures to address the challenges faced by the U.S. polysilicon sector, which has seen a significant decline in its global production share due to foreign competition. According to The White House, the decision to impose these regulations stems from a recent investigation by the Secretary of Commerce under section 232 of the Trade Expansion Act of 1962. The investigation concluded that the current import levels of polysilicon and its derivatives pose a threat to the national security of the United States. Polysilicon is not only essential for semiconductor production, which is vital for various defense and technology sectors, but also for solar-grade products that support defense programs and AI innovations. For years, fo reign policies have encouraged increased production of polysilicon abroad, leading to an oversupply and diminishing the U.S. industry's capacity to compete. Since 2005, the U.S. share of global polysilicon production has plummeted from 50 percent to less than 2 percent, with similar declines observed in semiconductor and solar production capacities. The new measures include the establishment of minimum import prices for polysilicon and its derivatives, alongside a 15 percent ad valorem duty on downstream products. These actions aim to create a protected domestic market, enabling U.S. producers to compete effectively. Furthermore, incentives will be offered to companies investing in U.S.-based polysilicon production facilities, with the Secretary of Commerce authorized to approve onshoring plans to bolster domestic manufacturing. The adjustments are set to take effect from December 4, 2026, and will be closely monitored by U.S. Customs and Border Protection to ensure compliance. Importers are required to pro vide documentation proving adherence to the minimum import prices, failing which they will incur specific tariffs. The administration is also prepared to take further action if necessary to ensure the effectiveness of these measures in securing the nation's economic and national security interests.