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Naphthalene Trisulfonic Acid Trisodium Salt from Mexico

1,3,6-Naphthalenetrisulfonic acid trisodium salt is a multi-sulfo derivative of naphthalene used in azo dye synthesis. Contains only sulfo groups, qualifying for HTS 2908.99.1500 as sulfonated phenol derivative.

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

HPLC purity >98% certification required; light-sensitive - opaque packaging

Common issue: Dye coupling agents scrutinized for Chapter 32 colorant classification