4,4'-Diamino-2,2'-stilbenedisulfonic acid
This is a specific aromatic polyamine derivative with two amino groups and sulfonic acid groups, classified under HTS 2921.59.2000 as it exactly matches the chemical structure of 4,4'-diamino-2,2'-stilbenedisulfonic acid. It serves as a key intermediate in dye synthesis, particularly for direct dyes used in textile coloring.
Import Duty Rates by Country of Origin
| Origin Country | MFN Rate | Ch.99 Surcharges | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | 6.5% | +35.0% | 41.5% |
| 🇲🇽Mexico | 6.5% | +10.0% | 16.5% |
| 🇨🇦Canada | 6.5% | +10.0% | 16.5% |
| 🇩🇪Germany | 6.5% | +10.0% | 16.5% |
| 🇯🇵Japan | 6.5% | +10.0% | 16.5% |
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If formulated as synthetic dye for retail or industrial use
Finished synthetic azo dyes fall under Chapter 32, not Chapter 29 chemical intermediates.
If chemically modified or contains impurities exceeding specification
Other aromatic polyamines not specifically named go to the residual 2921.59.8000 subheading.
If considered an organo-sulfur compound with different functional priority
Chapter notes prioritize sulfur compounds in 2930, but sulfonic derivatives stay in amine headings.
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Import Tips & Compliance
• Verify purity and chemical identity via certificate of analysis to confirm classification under 2921.59.2000
• Include Safety Data Sheet (SDS) and ensure proper hazardous material labeling for sulfonic acid compounds
• Avoid misclassification as finished dyes; this is a pure chemical intermediate per Chapter 29 notes
Related Products under HTS 2921.59.20.00
DAS (4,4'-Diamino-2,2'-stilbenedisulfonic acid) Technical Grade
Technical grade DAS is a high-purity form of 4,4'-diamino-2,2'-stilbenedisulfonic acid used in optical brightener production. It falls under HTS 2921.59.2000 due to its precise chemical identity as a chemically defined aromatic polyamine per Chapter 29 note (a). Impurities are minimal and do not alter its classification.
4,4'-Diaminostilbene-2,2'-disulfonic acid Powder
Powdered form of 4,4'-diamino-2,2'-stilbenedisulfonic acid, a white to light yellow crystalline compound used as a dye precursor. Classified specifically under HTS 2921.59.2000 as a separate chemically defined organic compound per Chapter 29 scope. The powder form with anti-caking agent is allowed under note (f).