4-Amino-1-naphthalenesulfonic acid, sodium salt (Naphthionic acid sodium salt)
Naphthionic acid sodium salt, chemically 4-amino-1-naphthalenesulfonic acid sodium salt, serves as a diazo component in dye chemistry. It matches HTS 2921.45.20.00 explicitly as a named aromatic monoamine derivative and salt thereof. Supplied as a soluble powder for coupling reactions in pigment production.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If derived from aniline rather than naphthalene base
Aniline (phenylamine) derivatives and salts classify under separate subheading 2921.42 within aromatic monoamines.
If for unspecified aromatic monoamine salts
Residual provision catches aromatic amines not specifically provided for elsewhere in heading 2921.49.
If heavily contaminated with inorganic salts
Note 2(C)(1) directs inorganic salts of organics to the organic compound heading, but high contamination may invoke Chapter 28.
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Import Tips & Compliance
• Certify sodium salt form with ionic content analysis; free acid form might classify differently under amine headings
• Declare as 'not for retail sale' to prevent shift to Chapter 32 exclusions for coloring matter preparations
• Monitor purity thresholds; impurities over 5% may trigger mixture classification under heading 3824
Related Products under HTS 2921.45.20.00
Laurent's Acid (5-Amino-1-naphthalenesulfonic acid)
Laurent's acid is a sulfonated derivative of 1-naphthylamine, specifically 5-amino-1-naphthalenesulfonic acid, used primarily as an intermediate in dye synthesis. It falls under HTS 2921.45.20.00 as an aromatic monoamine derivative with sulfonic acid groups, matching the chapter's provisions for chemically defined organic compounds with nitrogen functions. The product is typically supplied as a white to light yellow powder for industrial chemical applications.
8-Amino-2-naphthalenesulfonic acid (Chicago Acid)
Chicago acid, or 8-amino-2-naphthalenesulfonic acid, is a key naphthalene-based amine-sulfonic acid used in azo dye manufacturing. Classified under HTS 2921.45.20.00 as a derivative salt of 2-naphthylamine with sulfonic functionality, fitting the aromatic monoamine category in Chapter 29. It appears as an off-white crystalline powder essential for textile dye intermediates.
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 specifically listed under HTS 2921.45.20.00 as an aromatic amine derivative with multiple sulfonic groups. The compound is a brownish powder used in high-performance textile dyes.
8-Anilino-1-naphthalenesulfonic acid (Phenyl Peri acid) and its salts
Phenyl Peri acid, 8-anilino-1-naphthalenesulfonic acid, features an anilino substitution on naphthylamine with sulfonic acid. Explicitly covered by HTS 2921.45.20.00 as a named derivative salt of aromatic monoamines. Used in specialty dyes requiring peri-position reactivity.
7-Amino-1,3,6-naphthalenetrisulfonic acid (R-acid)
R-acid, chemically 7-amino-1,3,6-naphthalenetrisulfonic acid, is a trisulfonated naphthylamine for direct dyes. Listed under HTS 2921.45.20.00 for its aromatic amine-sulfonic structure per Chapter 29 definitions. Typically a soluble salt form for aqueous dye processing.
N-Ethyl-1-naphthylamine
N-Ethyl-1-naphthylamine is an alkylated derivative of 1-naphthylamine explicitly named in HTS 2921.45.20.00. This liquid aromatic monoamine serves as an intermediate in pharmaceutical and dye production without sulfonic groups. It fits Chapter 29 as a chemically defined amine-function compound.