4-Amino-3-hydroxy-1-naphthalenesulfonic acid from China
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 — China → United States
43.3%
Rate breakdown
9903.88.0325%Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China
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