4-Amino-5-Hydroxy-2,7-Naphthalenedisulfonic Acid (H Acid) from China
H Acid is premier dye intermediate with amino-naphthalene core structure. HTS 2921.45.90 as 'other' naphthylamine derivative; multiple functions but amine principal. Widely used in reactive/direct dyes for cotton.
Duty Rate — China → United States
41.5%
Rate breakdown
9903.03.0110%Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 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
• CAS 90-64-2; sodium salt form CAS 5182-63-2 most common
• Light-sensitive; dark packaging mandatory
• 97% min purity standard; HPLC certificate required by dye manufacturers