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.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If viewed solely as sulfonic acid salt without organic base
Organic structure prevails in Chapter 29 over inorganic sulfites in Chapter 28.
If containing sulfur directly linked beyond sulfo
Other organo-sulfur compounds in 2930, but sulfo-only stays in 2908 per notes.
If as aqueous solution for safety transport
Excess solvent making it transport-specific shifts from Chapter 29 per note (e).
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Import Tips & Compliance
• Document hydrate water content separately from solvent notes
• Ensure stabilization doesn't exceed preservation limits
• Test for consistency in batch declarations
Related Products under HTS 2908.99.06.00
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.
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.
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.