1-Naphthol-4-sulfonic acid
1-Naphthol-4-sulfonic acid is a sulfonated derivative of 1-naphthol, featuring a sulfo group at the 4-position on the naphthalene ring. It falls under HTS 2908.99.06.00 as a chemically defined organic compound containing only sulfo groups, classified among halogenated, sulfonated derivatives of phenols or phenol-alcohols.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If formulated as synthetic dye for retail or industrial use
Dyes and coloring matter derived from such compounds are classified in Chapter 32, not as pure chemical intermediates.
If lacking the sulfo group, as a simple naphthol derivative
Without sulfonation, it becomes a ketone or quinone-function compound under heading 2914, per chapter note on oxygen functions.
If imported as a mixture or solution exceeding Chapter 29 limits
Solutions or mixtures not qualifying under Chapter 29 note (e) fall into mixtures of Chapter 38.
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Import Tips & Compliance
• Verify purity certificate to confirm it meets chemically defined compound criteria per Chapter 29 notes
• Provide detailed chemical analysis for CBP classification
• Avoid packaging that suggests retail sale to prevent reclassification under Chapter 32
Related Products under HTS 2908.99.06.00
Sodium 1-Naphthol-4-sulfonate
The sodium salt of 4-Hydroxy-1-naphthalenesulfonic acid, used in azo dye coupling reactions. Classified under HTS 2908.99.06.00 per Chapter 29 note 5(C)(1), as inorganic salts of organic sulfo-function compounds are placed with the parent acid.
Potassium 1-Naphthol-4-sulfonate
Potassium salt form of 1-Naphthol-4-sulfonic acid, soluble for use in textile dye manufacturing. Fits HTS 2908.99.06.00 as a salt of a sulfo-group derivative of phenol-alcohols, following Chapter 29 salt classification rules.
4-Hydroxy-1-naphthalenesulfonic acid, 98% purity
High-purity technical grade 1-Naphthol-4-sulfonic acid for pharmaceutical and dye intermediates. Qualifies under HTS 2908.99.06.00 as a separate chemically defined compound with only sulfo groups, per Chapter 29 scope.
1-Naphthol-4-sulfonic acid monohydrate
Hydrated form of 1-Naphthol-4-sulfonic acid, stable for transport in dye production. Remains under HTS 2908.99.06.00 as water-associated product of (d) note, not altering chemical classification.
Ammonium 1-Naphthol-4-sulfonate
Ammonium salt of 4-Hydroxy-1-naphthalenesulfonic acid, used in analytical chemistry. Classified in HTS 2908.99.06.00 following Chapter 29 rule for salts of sulfo derivatives.