4,4'-Benzidine-2,2'-Disulfonic Acid from Mexico
4,4'-Benzidine-2,2'-disulfonic acid is a specific aromatic polyamine derivative with two sulfonic acid groups, explicitly listed under HTS 2921.59.1700. It is a chemically defined organic compound used primarily as an intermediate in dye and pigment synthesis.
Duty Rate — Mexico → United States
10%
Rate breakdown
9903.03.0110%Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Import Tips
• Verify chemical purity and provide Certificate of Analysis (CoA) to confirm it matches the exact compound listed in the HTS description
• Ensure packaging complies with DOT/UN hazardous material regulations as it may be classified as corrosive due to sulfonic acid groups
• Avoid misclassification as a dye intermediate under Chapter 32; include lab test results showing it's a separate chemical compound