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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If Tobias acid (2-naphthylamine-1-sulfonic acid)
Position isomers of naphthylamine sulfonic acids have specific statistical reporting numbers.
If classified as organo-sulfur compound
Chapter notes exclude sulfonated amine derivatives from heading 2930.
If for reactive dye production
Finished reactive dyes containing this moiety as chromophore classify by color use.
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
• Provide IUPAC name and synonyms on labeling to match HTS description exactly
• Comply with TSCA pre-manufacture notification if first import
• Segregate from oxidizing materials during transport per DOT regulations
Related Products under HTS 2921.45.60.00
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.
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.
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.