Sulfanilic acid
Amine-function compounds > Aromatic monoamines and their derivatives; salts thereof: > Aniline derivatives and their salts: > Sulfanilic acid
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Products classified 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.
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.
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.