2921.45.90.90/4-Amino-5-hydroxynaphthalene-2,7-disulfonic Acid (H Acid)/Canada

4-Amino-5-hydroxynaphthalene-2,7-disulfonic Acid (H Acid) from Canada

H acid is a multi-substituted 1-naphthylamine derivative essential for direct and reactive dyes in cotton dyeing. Classified in HTS 2921.45.90.90 as 'other' α-naphthylamine derivative, the amine group defines its place despite phenolic and sulfonic functions. Chapter 29 classification rules ensure amine-function precedence.

Duty Rate — Canada → United States

16.5%

Rate breakdown

9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada

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Import Tips

• Include chromatograms showing >95% purity; multi-functional nature invites classification challenges

• Declare as 'amine-function compound' explicitly on commercial invoice with structure diagram

• For EU-sourced material, verify REACH compliance as it affects US import documentation