Styrene Sulfonic Acid Sodium Salt from China
Sodium styrenesulfonate (CAS 1230-52-2) monomer contains sulfo group on phenylethylene, classified as sulfonated phenol derivative under HTS 2908.99.1500. Used in polymer synthesis for ion exchange resins.
Duty Rate — China → United States
43%
Rate breakdown
9903.88.0325%Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China
Import Tips
• Polymerization inhibitor content specification; inhibitor-free grades need stabilization
• Pitfall: Monomer/polymer confusion - provide GPC confirming Mw <500 Da