2921.45.20.00/8-Amino-2-naphthalenesulfonic acid (Chicago Acid)/Mexico

8-Amino-2-naphthalenesulfonic acid (Chicago Acid) from Mexico

Chicago acid, or 8-amino-2-naphthalenesulfonic acid, is a key naphthalene-based amine-sulfonic acid used in azo dye manufacturing. Classified under HTS 2921.45.20.00 as a derivative salt of 2-naphthylamine with sulfonic functionality, fitting the aromatic monoamine category in Chapter 29. It appears as an off-white crystalline powder essential for textile dye intermediates.

Duty Rate — Mexico → United States

15.8%

Rate breakdown

9903.03.0110%Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter

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Import Tips

• Label shipments with exact CAS number (118-93-4) and batch purity to facilitate CBP verification against the specific HTS listing

• Include end-use statements confirming industrial dye intermediate use to avoid exclusion under note 7(g) for colored preparations

• Check for stabilizer additions; if exceeding safety/transport limits, may require reclassification under different provisions