Pharmaceutical Grade Sulfanilic Acid USP
USP-grade sulfanilic acid meets pharmacopeia standards for use in diagnostic reagents and synthesis of sulfa drugs, classified under HTS 2921.42.22.00 as a pure aromatic monoamine derivative. Its high purity ensures compliance with Chapter 29 requirements for separate chemically defined compounds.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If used primarily as hormone intermediate
Certain medicinal derivatives shift to heterocyclic compounds if meeting hormone criteria.
If carboxylated derivative
Amino acid derivatives with carboxy groups classified under later nitrogen-function headings.
If for diagnostic lab reagents
Pre-mixed diagnostic preparations fall under chemical reagents heading.
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
• Include USP/EP certificate and DMF if destined for pharma use; FDA prior notice may apply
• Segregate from industrial grades to avoid contamination claims during customs inspection
• Watch for reclassification to 3002 if pre-formulated as immunological product
Related Products under HTS 2921.42.22.00
Sulfanilic Acid
Sulfanilic acid (4-aminobenzenesulfonic acid) is a white crystalline powder classified under HTS 2921.42.22.00 as an aniline derivative and salt thereof, consisting of a chemically defined aromatic monoamine with a sulfonic acid group. It serves as a key intermediate in dye manufacturing and pharmaceutical synthesis.
Bulk Sulfanilic Acid Flakes
Sulfanilic acid produced in flake form for industrial dye and pigment manufacturing is classified under HTS 2921.42.22.00 as the specific aniline derivative salt. The physical form does not affect chemical classification under Chapter 29 aromatic monoamines.
Technical Grade Sulfanilic Acid 98%
Technical grade sulfanilic acid at 98% purity is a bulk industrial chemical used primarily in azo dye production, classified as the specific aniline derivative under HTS 2921.42.22.00 per Chapter 29 notes for chemically defined compounds. It may contain minor impurities but remains a separate organic compound.
Sulfanilic Acid with 0.5% Stabilizer
Sulfanilic acid stabilized with 0.5% anticaking agent for safe transport and storage qualifies under HTS 2921.42.22.00 per Chapter 29 note (f), retaining classification as the base chemically defined compound. The stabilizer is necessary for preservation without altering general use.