5-Amino-2-naphthalenesulfonic acid (Laurent's Acid)
5-Amino-2-naphthalenesulfonic acid, also known as Laurent's acid, is a chemically defined aromatic amine derivative of naphthalene with a sulfonic acid functional group. It is a key diazo component used in the synthesis of reactive and direct dyes, and falls under tariff item 2921.45.00 as a derivative of 1-naphthylamine.
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
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Import Tips & Compliance
• Ensure the product is a separate chemically defined compound with no added substances that make it suitable for a specific use, per Chapter 29 Note 1
• Declare the correct 8-digit tariff item 2921.45.00 and be prepared to provide a Certificate of Analysis to confirm purity
• Verify if any end-use or drawback programs apply to dye intermediates
Related Products under Tariff item 2921.45.00
3-Amino-2,7-naphthalenedisulfonic acid (H-acid)
H-acid, or 3-amino-2,7-naphthalenedisulfonic acid, is a disulfonated naphthylamine derivative critical for reactive dye synthesis. It is a chemically defined aromatic amine derivative and falls under tariff item 2921.45.00 as a derivative of 2-naphthylamine.
4-Amino-1-naphthalenesulfonic acid, sodium salt (Naphthionic acid sodium salt)
Naphthionic acid sodium salt, or 4-amino-1-naphthalenesulfonic acid sodium salt, is a chemically defined aromatic amine derivative used as a diazo component in dye chemistry. It falls under tariff item 2921.45.00 as a salt of a 1-naphthylamine derivative.
5-Amino-2-naphthalenesulfonic Acid Monopotassium Salt
5-Amino-2-naphthalenesulfonic acid monopotassium salt is the potassium salt form of Laurent's acid, a chemically defined aromatic amine derivative. It is used in dye formulations requiring potassium counterions and is classified under tariff item 2921.45.00 as a salt of a naphthylamine derivative.
7-Amino-1,3,6-naphthalenetrisulfonic acid (R-acid)
R-acid, or 7-amino-1,3,6-naphthalenetrisulfonic acid, is a trisulfonated naphthylamine derivative used in direct dyes. It is a chemically defined aromatic amine derivative and falls under tariff item 2921.45.00 as a derivative of 2-naphthylamine.
7-Amino-1,3-naphthalenedisulfonic Acid Disodium Salt
7-Amino-1,3-naphthalenedisulfonic acid disodium salt is a chemically defined aromatic amine derivative with two sulfonic acid groups, used as a dye intermediate. It falls under tariff item 2921.45.00 as a salt of a naphthylamine derivative, specifically a derivative of 1-naphthylamine.
7-Amino-1,3-naphthalenedisulfonic acid (Sodium Salt)
7-Amino-1,3-naphthalenedisulfonic acid sodium salt is a chemically defined aromatic amine derivative with sulfonic acid groups, used as an intermediate in azo dye synthesis. It is classified under tariff item 2921.45.00 as a salt of a naphthylamine derivative.