4-Aminobenzenesulfonic Acid (Sulfanilic Acid)
Sulfanilic acid is an aromatic monoamine derivative featuring an amino group and a sulfonic acid group on a benzene ring, classified under HTS 2921.42.90.00 as an aniline derivative and its salt. It is primarily used in the synthesis of dyes, pharmaceuticals, and optical brighteners.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If imported as part of coordination complex with metals
Coordination compounds classified by last occurring fragment per Chapter 29 note 3(C)(3).
If further processed into synthetic dye for retail
Synthetic organic coloring matter excluded from Chapter 29 per chapter note 2(g).
If imported as aqueous solution exceeding transport concentration limits
Solutions only classifiable here if normal for safety/transport per chapter note 2(e).
Not sure which classification is right?
Our AI classifier can analyze your specific product and recommend the correct HTS code with confidence.
Import Tips & Compliance
• Verify purity certificate (typically 99%+) and CAS number 121-57-3 for customs classification as chemically defined compound
• Include Safety Data Sheet (SDS) showing it's not put up for retail sale to avoid Chapter 32 reclassification
Related Products under HTS 2921.42.90.00
p-Nitroaniline
p-Nitroaniline is a nitrated derivative of aniline with the nitro group para to the amino group, falling under HTS 2921.42.90.00 as an aromatic monoamine derivative. Used extensively in azo dye manufacturing and as a pharmaceutical intermediate.
2,4-Diaminoanisole Sulfate
This diamine derivative of methoxyaniline, supplied as sulfate salt, falls under HTS 2921.42.90.00 per classification rules for amine salts. Used in polymer synthesis and hair dye intermediates.
4-Phenylenediamine (PPD)
4-Phenylenediamine, a diamino derivative of aniline, is classified under HTS 2921.42.90.00 as an aromatic monoamine derivative. Widely used in rubber antioxidants, dyes, and photographic chemicals.
N-Phenyl-1-naphthylamine
This secondary aromatic amine, derived from aniline and naphthylamine, falls under HTS 2921.42.90.00 as an aniline derivative. Primarily used as a rubber antioxidant and stabilizer.
2,4,6-Trichloroaniline
Trichloroaniline with chlorines ortho and para to amino group, classified under HTS 2921.42.90.00 including halogenated derivatives per chapter note 4. Used in herbicide and dye synthesis.
4-Aminodiphenylamine
A diphenylamine derivative with one amino-substituted phenyl ring, classified as aniline derivative under HTS 2921.42.90.00. Used in rubber curing agents and dye intermediates.