1-Naphthylamine-4-sulfonic Acid (Naphthionic Acid) from China
Naphthionic Acid (1-Naphthylamine-4-sulfonic Acid) is an aminohydroxynaphthalenesulfonic acid derivative used in azo dye synthesis and pharmaceutical intermediates. Its structure includes amino and sulfonic acid groups on naphthalene with oxygen-function, placing it under tariff item 2922.21.00. The compound is a separate chemically defined organic compound per Chapter 29 Note 1(a).
Duty Rate — China → Canada
0%
Import Tips
• Verify that the product is not mixed with other isomers, as mixtures of isomers may be classified differently
• Provide a certificate of analysis to confirm the chemical identity and purity
• Be prepared to explain the end-use to customs if asked, as dye intermediates may be subject to verification