7-Amino-1,3-naphthalenedisulfonic acid and its salts; 5-Amino-2-naphthalenesulfonic acid and its salts; 8-Amino-1-naphthalenesulfonic acid and its salts; andN-Phenyl-2-naphthylamine
Amine-function compounds > Aromatic monoamines and their derivatives; salts thereof: > 1-Naphthylamine (α-Naphthylamine), 2-Naphthylamine (β-Naphthylamine), and their derivatives; salts thereof: > 7-Amino-1,3-naphthalenedisulfonic acid and its salts; 5-Amino-2-naphthalenesulfonic acid and its salts; 8-Amino-1-naphthalenesulfonic acid and its salts; andN-Phenyl-2-naphthylamine
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 2921.45.10.00
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.
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.
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.
7-Amino-1,3-naphthalenedisulfonic Acid Disodium Salt
The disodium salt form of 7-Amino-1,3-naphthalenedisulfonic acid provides better water solubility for dye coupling processes. Explicitly covered under HTS 2921.45.10.00 as salts of the listed naphthalenedisulfonic acid amine. Inorganic salts of organic compounds classify with the parent organic acid per Chapter 29 note 3(C).