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.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If for other 2-naphthylamine derivatives not specifically named
General derivatives and salts of naphthylamines not matching the exact listed compounds fall into the residual subheading.
If considered a sulfonic acid without prominent amine function
Chapter notes prioritize classification by the principal function; pure sulfonic acids of aromatics may go to heading 2904.
If imported as mixture with solvents exceeding transport allowances
Solutions beyond safety/transport exceptions per chapter note 1(e) classify as chemical preparations in Chapter 38.
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Import Tips & Compliance
• Label shipments with exact CAS number (118-93-4) and batch purity to facilitate CBP verification against the specific HTS listing
• Include end-use statements confirming industrial dye intermediate use to avoid exclusion under note 7(g) for colored preparations
• Check for stabilizer additions; if exceeding safety/transport limits, may require reclassification under different provisions
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.
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.
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.