7-Amino-1-hydroxynaphthalene-3-sulfonic Acid
Also known as J acid, this naphthylamine derivative with hydroxy and sulfonic groups is crucial for synthesizing reactive and direct dyes. It qualifies for HTS 2921.45.90.90 as an 'other' derivative of 1-naphthylamine per Chapter 29 amine-function priority. The molecule's primary aromatic amine defines its tariff classification.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If phenolic hydroxy function predominates over amine
Oxygen-function amino-phenols class in 2922 per Chapter notes on function priority.
If when used directly as synthetic dye coupler in retail forms
Chapter 29 excludes products classifiable as synthetic coloring matter in Chapter 32.
If for nucleic acid derivatives if chemically modified that way
Subchapter exclusion moves certain hetero-ring compounds later in Chapter 29.
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Import Tips & Compliance
• Submit IUPAC name and CAS (89-37-2) matching; hydroxy group doesn't override amine-function classification
• Watch for CBP scrutiny on multi-function compounds—provide expert opinion letter affirming Chapter 29 placement
• Package with anticaking agents only if necessary for preservation (Chapter 29 note f); excess additives trigger reclassification
Related Products under HTS 2921.45.90.90
4-Amino-1-naphthalenesulfonic Acid
4-Amino-1-naphthalenesulfonic acid is a derivative of 1-naphthylamine with a sulfonic acid group, used primarily as an intermediate in dye manufacturing. It falls under HTS 2921.45.90.90 as a derivative of 1-naphthylamine (α-naphthylamine) that is not specifically listed elsewhere in the subheading. This aromatic monoamine derivative contains the characteristic amine-function group directly linked to the naphthalene ring.
1-Naphthylamine-4,8-disulfonic Acid
This disulfonic acid derivative of 1-naphthylamine serves as a key intermediate for acid dyes and azoic coupling components. Classified under HTS 2921.45.90.90 as an 'other' derivative of α-naphthylamine, it retains the primary aromatic amine function despite sulfonic substitutions. The classification follows Chapter 29 rules prioritizing amine-function compounds.
1-Naphthylamine-8-sulfonic Acid (Peri Acid)
Peri acid is a monosulfonic derivative of 1-naphthylamine used in azo dye production for textiles. It falls under HTS 2921.45.90.90 as an unspecified derivative of α-naphthylamine, maintaining classification in the amine-function heading. The sulfonic acid enhances water solubility without altering the core amine classification.
4-Amino-5-hydroxynaphthalene-2,7-disulfonic Acid (H Acid)
H acid is a multi-substituted 1-naphthylamine derivative essential for direct and reactive dyes in cotton dyeing. Classified in HTS 2921.45.90.90 as 'other' α-naphthylamine derivative, the amine group defines its place despite phenolic and sulfonic functions. Chapter 29 classification rules ensure amine-function precedence.
2-Naphthylamine-6-sulfonic Acid (Laurent's Acid)
Laurent's acid, a derivative of 2-naphthylamine (β-naphthylamine), is used in acid dye synthesis. It is classified under HTS 2921.45.90.90 as an 'other' derivative within the naphthylamine subheading. The aromatic amine-function remains the principal characteristic for tariff purposes.
1-(Phenylamino)naphthalin-8-sulfonic Acid (Naphthol AS)
Naphthol AS is a substituted naphthylamine derivative used as a dye coupler in pigment printing. It falls under HTS 2921.45.90.90 as an 'other' derivative featuring the naphthylamine core with phenylamino substitution. The classification adheres to Chapter 29's amine-function provisions.