4-Amino-3-hydroxy-1-naphthalenesulfonic acid from Germany
This specifically named aminohydroxynaphthalenesulfonic acid under HTS 2922.21.1000 serves as a building block for direct dyes and metal complex dyes. Contains required amino, hydroxy, and sulfonic functions on naphthalene core. Technical grade 90%+ purity standard.
Duty Rate — Germany → United States
10%
Rate breakdown
9903.05.3910%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.97, articles the product of a member state of the European Union, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 10 percent, as provided for in U.S. note 52 to this subchapter
Import Tips
• Position-specific isomer verification via LC-MS essential
• Biuret test confirms absence of urea impurities from synthesis
• Customs lab testing common for novel naphthalenedisulfonic isomers