Styrene Sulfonic Acid Sodium Salt from Mexico
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 — Mexico → United States
15.5%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Polymerization inhibitor content specification; inhibitor-free grades need stabilization
• Pitfall: Monomer/polymer confusion - provide GPC confirming Mw <500 Da