1-Amino-8-hydroxy-3,6-naphthalenedisulfonic acid from China
This specific diaminohydroxynaphthalenedisulfonic acid is explicitly listed in HTS 2922.21.1000 and serves as a diazo coupling component in acid dye synthesis. Its structure features both amino (-NH2) and hydroxy (-OH) oxygen functions on the naphthalene ring with sulfonic acid groups. Supplied as technical grade powder (95%+ purity) for chemical manufacturing.
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
• Batch testing required to verify isomer identity versus other naphthalenedisulfonic acids
• Moisture content analysis prevents weight-based duty disputes on hygroscopic material
• EPA TSCA certification needed for US manufacturing introduction