2921.45.90.90/4-Amino-1-naphthalenesulfonic Acid/China

4-Amino-1-naphthalenesulfonic Acid from China

4-Amino-1-naphthalenesulfonic acid is a derivative of 1-naphthylamine with a sulfonic acid group, used primarily as an intermediate in dye manufacturing. It falls under HTS 2921.45.90.90 as a derivative of 1-naphthylamine (α-naphthylamine) that is not specifically listed elsewhere in the subheading. This aromatic monoamine derivative contains the characteristic amine-function group directly linked to the naphthalene ring.

Duty Rate — China → United States

44%

Rate breakdown

9903.05.3112.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of China, as provided for in U.S. note 52 to this subchapter

9903.88.0325%Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)

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Import Tips

• Provide detailed chemical analysis (NMR, IR spectra) to confirm it's a naphthylamine derivative under Chapter 29 note (a)

• Ensure COA verifies purity >98% as impurities may affect classification; declare exact CAS number (84-86-6)

• Avoid misclassification as sulfonated dyes (Chapter 32); include lab reports showing amine-function dominance