5-Amino-2-naphthalenesulfonic Acid (1,5 Cleve's Acid) from Canada
5-Amino-2-naphthalenesulfonic acid, also known as Cleve's acid 1,5-isomer, serves as a critical coupler in azo pigment production. It qualifies under HTS 2921.45.25.00 due to its explicit inclusion in mixtures and as a 2-naphthylamine sulfonic derivative. As a separate chemically defined compound, it aligns with Chapter 29(a).
Duty Rate — Canada → United States
10%
Rate breakdown
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
Import Tips
• Submit structural confirmation via NMR to validate aromatic monoamine classification
• Use UN-approved plastic drums with liners for moisture-sensitive sulfonic acids
• Check for nitrogen content labeling to prevent reclassification under sulfonated hydrocarbons