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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If other naphthylamine derivative not in note 3
Statistical suffixes distinguish note 3 products from general derivatives.
If as component in dispersed dye
Dye preparations containing multiple amine derivatives classify by color function.
If carboxylated derivative
Addition of carboxy groups creates oxygen-function compounds under heading 2924.
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
• Label with GHS pictograms for skin corrosion and aquatic toxicity hazards
• Verify country of origin as antidumping duties may apply to certain dye intermediates
• Use refrigerated containers if stability data indicates temperature sensitivity
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.
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.
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.