4-Aminoazobenzene-2,4-disulfonic Acid Monosodium Salt (Dye Intermediate)
Pure monosodium salt form of the disulfonic acid derivative of 4-aminoazobenzene, a diazo compound used in azo dye manufacturing. Classified under HTS 2927.00.03.00 for its specific chemical structure as a named separate organic compound per Chapter 29 note (a). Supplied as technical grade powder for industrial synthesis.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If for other simple diazo-compounds without sulfonic groups
Diazo-compounds (not azo) have earlier numerical order in 2927; specific named compounds take precedence per chapter note.
If containing additional heterocyclic nitrogen rings
Nucleic acids and derivatives move to 2934; this compound's simple aromatic azo structure stays in 2927.
If imported as mixture with solvents or stabilizers beyond chapter allowances
Chapter note (e) limits solvent solutions to safety/transport; other mixtures fall to prepared chemical mixtures in 3824.
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Import Tips & Compliance
• Include CoA (Certificate of Analysis) specifying CAS number and structure confirmation via NMR/spectroscopy
• Declare exact sodium content and water of hydration to avoid disputes over 'monosodium' specification
Related Products under HTS 2927.00.03.00
Monosodium 4-Aminoazobenzene-2,4-disulfonate
This is the monosodium salt of 4-aminoazobenzenedisulfonic acid, a chemically defined diazo compound with an azo (-N=N-) linkage and sulfonic acid groups. It falls under HTS 2927.00.03.00 as a specific azo-compound listed in the tariff schedule for separate chemically defined organic compounds. Primarily used as an intermediate in dye synthesis.
Sodium Salt of 4-Aminoazobenzene Disulfonate (CAS 20592-48-5)
Commercially available as CAS 20592-48-5, this monosodium salt features the precise structure of 4-aminoazobenzenedisulfonic acid with one sodium cation. HTS 2927.00.03.00 explicitly names this compound as a diazo-/azo- compound within Chapter 29's scope for pure organic chemicals. Used in coupling reactions for disperse dye production.
Technical Grade 4-Aminoazobenzene-2,4-disulfonate Sodium
Technical grade (>92% purity) monosodium salt of the named disulfonic acid azo-compound, containing minor stabilizers per Chapter 29 note (f). Remains under HTS 2927.00.03.00 as the principal chemically defined organic compound with impurities not altering classification. Standard for batch dye synthesis.