Pyromellitic Dianhydride (PMDA) from Canada
Pyromellitic dianhydride is a tetrafunctional aromatic dianhydride used in high-performance polyimides for electronics and aerospace. Falls under HTS 2917.39.70.00 as an aromatic polycarboxylic acid anhydride derivative. Its rigid structure enables superior thermal stability.
Duty Rate — Canada → United States
16.5%
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
• Molecular weight and purity certification required to distinguish from polymer intermediates
• Highly reactive; ship under nitrogen atmosphere with stabilizer documentation