3,5-Naphthalenedisulfonic Acid from Mexico
While not explicitly named, 3,5-naphthalenedisulfonic acid falls under HTS 2904.10.10.00 as a naphthalene derivative containing only sulfo groups, consistent with the heading's scope for disulfonic acids. Used in dye coupling and surfactant production.
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
• Position isomer documentation critical; 1,5 vs 3,5 affects reactivity but same tariff
• pH adjustment documentation needed for acid vs salt forms during customs valuation
• Avoid bulk packaging over 25kg drums to prevent corrosion classification issues