3,3'-Diaminobenzidine (Tetraaminobiphenyl) from Canada
3,3'-Diaminobenzidine, a tetrafunctional aromatic polyamine also called tetraaminobiphenyl, is named in HTS 2921.59.1700. It is essential for polybenzimidazole polymers and high-performance engineering plastics.
Duty Rate — Canada → 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
• Include polymerization inhibition certificates if stabilized for transport
• High purity grades (>98%) require HPLC chromatograms for duty verification
• Prevent oxidation during shipping; use nitrogen-purged containers