Naphthalene Trisulfonic Acid Trisodium Salt from Japan
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 — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%
Import Tips
• HPLC purity >98% certification required; light-sensitive - opaque packaging
• Common issue: Dye coupling agents scrutinized for Chapter 32 colorant classification