4-Amino-5-Hydroxy-2,7-Naphthalenedisulfonic Acid (H Acid) from Japan
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 — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of Japan, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 12.5 percent, as provided for in U.S. note 52 to this subchapter
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