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% | +37.5% | 44% |
| 🇲🇽Mexico | 6.5% | +10.0% | 16.5% |
| 🇨🇦Canada | 6.5% | +10.0% | 16.5% |
| 🇩🇪Germany | Free | +10.0% | 10% |
| 🇯🇵Japan | Free | +12.5% | 12.5% |
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.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
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.