4-Amino-2-stilbenesulfonic acid from Germany
4-Amino-2-stilbenesulfonic acid is a specific aromatic amine derivative with a sulfonic acid group, explicitly listed under HTS 2921.49.10.00. It is primarily used as an intermediate in the production of optical brightening agents for textiles, paper, and detergents. This chemically defined compound falls within Chapter 29 for separate organic compounds with amine-function groups.
Duty Rate — Germany → United States
10%
Rate breakdown
9903.05.3910%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.97, articles the product of a member state of the European Union, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 10 percent, as provided for in U.S. note 52 to this subchapter
Import Tips
• Verify purity certificate (≥98%) and provide chemical analysis to confirm identity as listed in HTS 2921.49.10.00
• Include Safety Data Sheet (SDS) and ensure packaging complies with DOT/UN regulations for hazardous chemicals
• Avoid misclassification as dye intermediates under Chapter 32; request binding ruling for custom formulations