5-Amino-2-naphthalenesulfonic acid (Laurent's Acid)
Laurent's acid, or 5-Amino-2-naphthalenesulfonic acid, is an aromatic monoamine and its derivatives used as a key diazo component in reactive and direct dyes. It is explicitly listed under HTS 2921.45.10.00 within the naphthalene amine derivatives category. The compound's amino and sulfonic groups on the naphthalene ring define its classification in Chapter 29 for separate chemically defined organic compounds.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If classified under other naphthylamine derivatives
Slight structural variations might place it under the broader naphthylamine salts subheading.
If when supplied as synthetic organic dye intermediate preparation
If put up in forms particularly suitable for dye manufacture beyond Chapter 29 scope, moves to Chapter 32.
If containing organo-sulfur directly linked beyond sulfonation
Chapter notes exclude sulfonated derivatives with additional sulfur-carbon bonds from heading 2930.
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Import Tips & Compliance
• Provide IUPAC name and CAS (99-09-2) on commercial invoice to match exact HTS description and avoid reclassification
• Ensure REACH/ TSCA compliance certification for environmental handling of sulfonic acid compounds
Related Products under HTS 2921.45.10.00
7-Amino-1,3-naphthalenedisulfonic acid (Sodium Salt)
This is the sodium salt of 7-Amino-1,3-naphthalenedisulfonic acid, a chemically defined aromatic amine derivative with sulfonic acid groups, used primarily as an intermediate in azo dye synthesis. It falls under HTS 2921.45.10.00 as it is specifically listed among the naphthalenedisulfonic acid amine derivatives and their salts in the amine-function compounds heading. The compound contains the characteristic amino group on a naphthalene ring with sulfonic substituents.
N-Phenyl-2-naphthylamine (β-Naphthylphenylamine)
N-Phenyl-2-naphthylamine is an aromatic monoamine derivative used as an antioxidant in rubber production and as a dye intermediate. It is specifically named in HTS 2921.45.10.00 under naphthylamine derivatives. As a chemically defined compound with amine-function on substituted naphthalene, it fits Chapter 29 aromatic monoamines.
5-Amino-2-naphthalenesulfonic Acid Monopotassium Salt
Potassium salt of Laurent's acid (5-Amino-2-naphthalenesulfonic acid) used in specific dye formulations requiring potassium counterions. Falls under HTS 2921.45.10.00 per explicit listing and Chapter note classifying salts with parent organic compound. Chemically defined aromatic amine derivative.
8-Amino-1-naphthalenesulfonic Acid (Free Acid Form)
Free acid form of Schaeffer's acid used where strong acidic conditions needed in dye processes. Specifically listed under HTS 2921.45.10.00 covering both acids and salts. Pure chemically defined aromatic sulfonic acid amine.
N-Phenyl-2-naphthylamine Technical Grade (98%)
Technical grade N-Phenyl-2-naphthylamine (98% purity) used in rubber compounding as oxidation inhibitor. Remains classified under HTS 2921.45.10.00 as specifically named compound despite impurities <2%. Chapter 29 covers compounds with impurities.
8-Amino-1-naphthalenesulfonic acid (Schaeffer's Acid)
Schaeffer's acid (8-Amino-1-naphthalenesulfonic acid) serves as a crucial intermediate for producing direct and reactive dyes, featuring an amino group ortho to the sulfonic acid on naphthalene. Classified under HTS 2921.45.10.00 as one of the specifically enumerated naphthalenesulfonic acid amines. Meets Chapter 29 criteria for separate chemically defined aromatic monoamines and derivatives.