US Hits Taiwan Chemicals with Duties Over Unfair Trade Practices
Published Date: 3/9/2026
Notice
Summary
The U.S. has decided that imports of certain chemical products called MAMMOs from Taiwan are hurting American businesses because they’re being sold too cheaply and getting unfair government help. This means extra duties will be applied to these imports to protect U.S. companies. If you’re in the chemical industry or trade, expect changes soon that could affect prices and supply starting in 2026.
Analyzed Economic Effects
2 provisions identified: 1 benefits, 1 costs, 0 mixed.
Final Duty Orders on MAMMOs from Taiwan
The U.S. International Trade Commission found on March 4, 2026 that imports of multifunctional acrylate and methacrylate monomers and oligomers (MAMMOs) from Taiwan were sold at less than fair value and subsidized, and that a U.S. industry has been materially injured. These products are covered under HTS codes 2916.12.50, 2916.14.20, 3824.99.29, 3907.29.00, and 3907.30.00, and the determinations support countervailing and antidumping duty orders on those imports.
Higher Costs for Importers and Buyers
Because Commerce found MAMMOs from Taiwan to be subsidized and sold at less than fair value and the Commission found U.S. industry injured (determinations filed March 4, 2026), countervailing and antidumping duty orders on these Taiwan imports will be in place. If you import or buy these specific MAMMO products (HTS 2916.12.50; 2916.14.20; 3824.99.29; 3907.29.00; 3907.30.00), you can expect additional duties to apply to those imports.
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Key Dates
Department and Agencies
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