1-Naphthylamine-4-sulfonic Acid (Naphthionic Acid)
Naphthionic Acid (1-Naphthylamine-4-sulfonic Acid) is an aminohydroxynaphthalenesulfonic acid derivative used in azo dye synthesis and pharmaceutical intermediates. Its structure includes amino and sulfonic acid groups on naphthalene with oxygen-function, placing it under tariff item 2922.21.00. The compound is a separate chemically defined organic compound per Chapter 29 Note 1(a).
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the compound is not a naphthalenesulphonic acid derivative
Other amino-naphthols and amino-phenols with oxygen functions.
If the compound contains more than one kind of oxygen function
Amino-compounds with oxygen function, excluding those in 2922.21.
If imported as a synthetic organic colouring matter
Synthetic organic colouring matter, per Section VI Note 2.
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Import Tips & Compliance
• Verify that the product is not mixed with other isomers, as mixtures of isomers may be classified differently
• Provide a certificate of analysis to confirm the chemical identity and purity
• Be prepared to explain the end-use to customs if asked, as dye intermediates may be subject to verification
Related Products under Tariff item 2922.21.00
1-Amino-8-hydroxy-3,6-naphthalenedisulfonic acid
1-Amino-8-hydroxy-3,6-naphthalenedisulfonic acid is a separate chemically defined organic compound with amino, hydroxy, and sulfonic acid groups on a naphthalene ring. It is a diazo coupling component used in the synthesis of acid dyes, falling under tariff item 2922.21.00 as an aminohydroxynaphthalenesulphonic acid.
4-Amino-3-hydroxy-1-naphthalenesulfonic acid
4-Amino-3-hydroxy-1-naphthalenesulfonic acid is a chemically defined aminohydroxynaphthalenesulphonic acid with amino, hydroxy, and sulfonic groups. It is used as a building block for direct and metal complex dyes, and falls under tariff item 2922.21.00.
6-Amino-1-naphthol-3-sulfonic acid (J Acid)
6-Amino-1-naphthol-3-sulfonic acid (J Acid) is an aminohydroxynaphthalenesulphonic acid used as an intermediate for direct and reactive dyes. It is a separate chemically defined compound, falling under tariff item 2922.21.00.
8-Amino-1-naphthol-5-sulfonic acid (Schaeffer's acid)
8-Amino-1-naphthol-5-sulfonic acid (Schaeffer's acid) is an aminohydroxynaphthalenesulphonic acid used as a dye intermediate for acid wool and reactive dyes. It is a separate chemically defined compound, classified under tariff item 2922.21.00.
Bayer's Acid Salt (1-Naphthylamine-4-sulfonic Acid Sodium Salt)
Bayer's Acid Salt (1-Naphthylamine-4-sulfonic Acid Sodium Salt) is a chemically defined organic compound used as an intermediate in the production of direct and reactive dyes. Its aminohydroxynaphthalenesulfonic acid structure places it under tariff item 2922.21.00, which covers such acids and their salts. The sodium salt form is included as a salt of the acid.
CAS 117-94-2 1-Amino-8-Naphthol-4,6-Disulfonic Acid Monosodium Salt
CAS 117-94-2 is the monosodium salt of 1-amino-8-hydroxy-4,6-naphthalenedisulfonic acid, a separate chemically defined compound. It is an aminohydroxynaphthalenesulphonic acid salt, classified under tariff item 2922.21.00.