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.
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More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If specifically 2-Naphthylamine (beta-Naphthylamine) derivative
Beta-naphthylamine derivatives have separate specific subheading 2921.45.20.
If imported as mixture with solvents for safety transport
Per chapter note (e), solutions in solvents for transport may classify under prepared chemical mixtures in 3824.
If for use as coupler in direct dyes
When functioning primarily as dye coupler rather than chemical intermediate, shifts to synthetic dye heading.
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Import Tips & Compliance
• Include IUPAC name and CAS (94-70-2) on documentation; declare as dye intermediate to avoid Chapter 32 misclassification
• Ensure packaging meets UN standards for corrosive solids; common issue is inadequate hazard labeling
• Provide end-use certificate if importing for dye manufacturing to facilitate CBP review
Related Products under HTS 2921.45.90
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.
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.