7-Amino-1,3-naphthalenedisulfonic Acid Disodium Salt from China
The disodium salt form of 7-Amino-1,3-naphthalenedisulfonic acid provides better water solubility for dye coupling processes. Explicitly covered under HTS 2921.45.10.00 as salts of the listed naphthalenedisulfonic acid amine. Inorganic salts of organic compounds classify with the parent organic acid per Chapter 29 note 3(C).
Duty Rate — China → United States
44%
Rate breakdown
9903.05.3112.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of China, as provided for in U.S. note 52 to this subchapter
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)
Import Tips
• Specify sodium content and counterion ratio in COA to confirm salt classification under organic parent
• Use moisture-proof packaging; hygroscopic nature affects assay during customs inspection