2922.21.10.00/H Acid Monosodium Salt (4-Amino-5-hydroxy-2,7-naphthalenedisulfonic acid, monosodium salt)/Mexico

H Acid Monosodium Salt (4-Amino-5-hydroxy-2,7-naphthalenedisulfonic acid, monosodium salt) from Mexico

H Acid monosodium salt is a key dye intermediate specifically enumerated under HTS 2922.21.1000 for use in manufacturing direct, reactive, and acid dyes. This salt form improves solubility and handling compared to the free acid. It contains both amino and hydroxy functions with naphthalene sulfonic acid structure as defined in chapter notes.

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

• Provide sodium content analysis to confirm salt form versus free acid classification

• Declare as UN 3265 if solution exceeds 10% concentration; dry powder typically UN 3077

• Avoid retail packaging that might trigger Chapter 32 classification for dye preparations