Sodium Salt of 1-Amino-8-naphthol-3,6-disulfonic Acid (H Acid)
H Acid sodium salt is a critical coupling component for reactive dyes, featuring amino-hydroxy-disulfonic functions on naphthalene. It meets Chapter 29 criteria for chemically defined amino-oxygen compounds and their salts. Positioned in 2922.21.5000 as 'other' aminohydroxynaphthalenesulfonic acids.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If pre-coupled with diazonium salts for direct dye use
Chapter note (h) moves azo dye intermediates out of Chapter 29.
If classified emphasizing carboxamide over amino-phenol functions
Numerical order rule could shift to later nitrogen-function headings.
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Import Tips & Compliance
• Declare exact salt form and water content; discrepancies lead to duty disputes
• Use HTSUS advisory rulings for multi-sulfonic derivatives to preempt CBP challenges
• Avoid packaging resembling retail dye forms (Chapter 32 exclusion)
Related Products under HTS 2922.21.50.00
Schaeffer's Acid (2-Naphthylamine-6-sulfonic acid)
Schaeffer's acid is an aminohydroxynaphthalenesulfonic acid used primarily as an intermediate in the production of azo dyes and pharmaceuticals. It features an amino group, hydroxyl group, and sulfonic acid group attached to a naphthalene ring, fitting Chapter 29 note (a) for chemically defined organic compounds. Classified under 2922.21.5000 as 'other' aminohydroxynaphthalenesulfonic acids and their salts.
K Acid (1-Naphthylamine-8-sulfonic Acid)
K Acid acts as a dye intermediate with amino and sulfonic groups on 1-naphthol structure. Meets definition of oxygen-function amino-compound under Chapter 29 notes. HTS 2922.21.5000 covers this as other aminohydroxynaphthalenesulfonic acid.
M Acid (1-Naphthylamine-5-sulfonic Acid)
M Acid provides amino-hydroxy-sulfonic functionality for naphthol AS dye series. Chemically defined per Chapter 29 (a), with oxygen-function amino characteristics. 2922.21.5000 classification for other such naphthalenesulfonic acids.
Tobias Acid (2-Naphthylamine-8-sulfonic acid)
Tobias acid serves as a key dye intermediate with amino, hydroxy, and sulfonic functionalities on naphthalene, used in acid dyes and optical brighteners. It qualifies as a separate chemically defined organic compound under Chapter 29. Falls under 2922.21.5000 for other aminohydroxynaphthalenesulfonic acids.
1-Naphthylamine-4-sulfonic Acid (Naphthionic Acid)
Naphthionic 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 characteristics. Classified in 2922.21.5000 as other such compounds.
Gamma Acid (2-Amino-8-naphthol-6-sulfonic Acid)
Gamma acid functions as a dye coupler with amino, naphthol, and sulfonic acid groups, used in acid and direct dyes. As a pure organic compound with oxygen-function amino groups, it aligns with Chapter 29 scope. Falls under 2922.21.5000 for other such acids.