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).
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 derived from aniline but with different substitution pattern
Aniline derivatives have specific subheadings; exact stilbene structure dictates 2921.59.2000.
If supplied as a reaction accelerator in catalyst mixtures
End-use formulations with catalysts shift to Chapter 38 per exclusions.
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Import Tips & Compliance
• Ensure packaging prevents dust; declare anti-dusting agents per Chapter note (g) to avoid reclassification
• Provide REACH or TSCA compliance docs if destined for US/EU chemical processing
Related Products under HTS 2921.59.20.00
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.
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.