1-Naphthylamine-4,8-disulfonic Acid (Casella's Acid) from Japan
1-Naphthylamine-4,8-disulfonic acid, also known as Casella's acid, is a naphthylamine derivative with two sulfonic acid groups, used primarily as an intermediate in the synthesis of direct dyes. It retains the primary amine function characteristic of heading 29.21, and its sulfonic acid substituents do not alter its classification as an aromatic monoamine derivative. This tariff item covers 1-naphthylamine, 2-naphthylamine, and their derivatives, including salts thereof.
Duty Rate — Japan → Canada
Import Tips
• Ensure the product is a separate chemically defined compound or a mixture of isomers, as required by Chapter 29 Note 1
• Declare the correct 8-digit tariff item 2921.45.00 and be prepared to provide a certificate of analysis to confirm the chemical identity
• If the product contains impurities, verify they are incidental to manufacture and do not render it suitable for a specific use