4-Amino-1-naphthalenesulfonic Acid
4-Amino-1-naphthalenesulfonic acid is an aromatic monoamine derivative of 1-naphthylamine with a sulfonic acid group, classified under HTS 2921.45.60.00 as a derivative of naphthylamine described in additional U.S. note 3 to section VI. It is commonly used as an intermediate in the production of azo dyes and pigments.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If not subject to additional U.S. note 3
Products not described in note 3 fall under the general 'other' subheading for naphthylamine derivatives.
If finished synthetic dye for retail
Completed azo dyes derived from this compound are classified in Chapter 32 based on use as coloring matter.
If aromatic but not naphthylamine-based
Other aromatic monoamine derivatives fall under different 2921.49 subheadings.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Verify chemical purity and provide Certificate of Analysis (CoA) to confirm classification under note 3 to section VI
• Ensure SDS and proper UN number for hazardous material shipping compliance
• Avoid misclassification as sulfonated dye under Chapter 32 by emphasizing amine-function principal characteristic
Related Products under HTS 2921.45.60.00
1-Naphthylamine-4,8-disulfonic Acid
This disulfonic acid derivative of 1-naphthylamine features two sulfonic acid groups, qualifying under HTS 2921.45.60.00 per additional U.S. note 3 to section VI. Used primarily as a dye intermediate in textile and leather industries.
2-Naphthylamine-6-sulfonic Acid (Schaeffer's Acid)
Schaeffer's acid is a key 2-naphthylamine derivative with a sulfonic acid substituent at position 6, falling under HTS 2921.45.60.00 due to additional U.S. note 3. Essential for manufacturing acid dyes and direct dyes.
1-Naphthylamine-8-sulfonic Acid (Peri Acid)
Peri acid, or 1-naphthylamine-8-sulfonic acid, is a derivative covered by HTS 2921.45.60.00 under additional U.S. note 3 to section VI. Widely used in azo pigment synthesis for inks and coatings.
2-Naphthylamine-3,6-disulfonic Acid (R Acid)
R Acid is a disulfonated derivative of 2-naphthylamine included in HTS 2921.45.60.00 per U.S. note 3. Critical intermediate for direct and reactive dyes used in cotton dyeing.
1-Naphthylamine-5-sulfonic Acid (Laurent's Acid)
Laurent's acid, a monosulfonated 1-naphthylamine derivative, is classified under HTS 2921.45.60.00 as specified in additional U.S. note 3. Used in manufacturing of acid dyes for wool and silk.