4-Amino-1-naphthalenesulfonic Acid
4-Amino-1-naphthalenesulfonic acid is a derivative of 1-naphthylamine with a sulfonic acid group attached, classified under HTS 2921.45.90 as an 'other' aromatic monoamine derivative and salt thereof. It is primarily used as an intermediate in the production of azo dyes and pigments.
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More Specific Codes
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If specifically 1-Naphthylamine (alpha-Naphthylamine) base compound
Pure 1-Naphthylamine without sulfonic substitution falls under the specific subheading 2921.45.10.
If further processed into synthetic azo dye
Once converted to finished synthetic organic coloring matter, it moves to Chapter 32 heading 3204.
If classified primarily by organo-sulfur functionality
Sulfonated compounds may shift to Chapter 29 heading 2930 if sulfur linkage dominates over amine function per chapter notes.
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Import Tips & Compliance
• Provide detailed chemical composition and CAS number (84-86-6) on commercial invoice for proper HTS verification
• Obtain SDS and ensure compliance with TSCA registration for US import of this dye intermediate
• Verify purity levels as impurities may affect classification; common pitfall is mislabeling as finished dye (Chapter 32)
Related Products under HTS 2921.45.90
1-Naphthylamine-4,8-disulfonic Acid (C Acid)
C Acid is a disulfonated derivative of 1-naphthylamine used extensively in azo dye synthesis for textiles and leather. It falls under HTS 2921.45.90 as an 'other' derivative of 1-Naphthylamine per Chapter 29 amine-function compounds. The naphthalene ring with amino group maintains its primary classification.
2-Naphthylamine-6-sulfonic Acid (Laurent's Acid)
Laurent's Acid is a sulfonated derivative of 2-naphthylamine (β-Naphthylamine) used in manufacturing acid dyes and pharmaceuticals. Classified under HTS 2921.45.90 as 'other' aromatic monoamine derivatives; salts thereof in Chapter 29. The retained naphthylamine structure governs classification over sulfonation.
1-Naphthylamine-8-sulfonic Acid (Peri Acid)
Peri Acid serves as a dye intermediate for naphthol AS dyes used in textile coloration. It qualifies under HTS 2921.45.90 as an 'other' 1-Naphthylamine derivative per Chapter 29's amine-function compounds. The peri-position sulfonic acid maintains aromatic monoamine classification.
N-Phenyl-1-Naphthylamine
N-Phenyl-1-naphthylamine (Neozone D) acts as an antioxidant and stabilizer in rubber and lubricant formulations. It classifies under HTS 2921.45.90 as a derivative of 1-Naphthylamine (aromatic monoamine). The secondary amine structure on naphthalene ring fits Chapter 29 perfectly.
2-Naphthylamine-1-sulfonic Acid (Tobias Acid)
Tobias Acid is the 1,2-isomer used in reactive dye synthesis for cotton textiles. HTS 2921.45.90 covers it as 'other' β-Naphthylamine derivative; salts thereof. Chapter 29 notes confirm amine-function precedence over sulfonation.
1-(Phenylamino)naphthalin-8-sulfonic Acid
This N-phenyl substituted peri acid derivative serves in acid dye manufacture. Falls under HTS 2921.45.90 as 'other' 1-Naphthylamine derivative per amine-function classification rules. Dual functionality but retains Chapter 29 status.