8-Amino-2-naphthalenesulfonic Acid (1,8 Cleve's Acid) from Mexico
8-Amino-2-naphthalenesulfonic acid (Cleve's acid 1,8-isomer) is a naphthylamine derivative used in direct dye synthesis. Named in HTS 2921.45.25.00 for mixtures containing this compound, it is a chemically defined aromatic amine per Chapter 29 scope. The sulfonic group maintains its amine-function classification.
Duty Rate — Mexico → United States
10%
Rate breakdown
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Provide batch-specific purity certificates (>98%) to qualify as 'chemically defined' vs mixtures
• Declare exact CAS number (118-43-4) on commercial invoice for automated CBP processing
• Monitor for cumulative impurities; levels >2% may shift to 2921.45.50 other derivatives