1,2,4,5-Tetracarboxybenzene (Pyromellitic Acid) from Canada
Pyromellitic acid, the diacid precursor to PMDA, is used in specialty polyimides and electronic materials. Classified under HTS 2917.39.70.00 as an aromatic polycarboxylic acid (four -COOH groups on benzene). Typically handled as dihydrate form.
Duty Rate — Canada → United States
16.5%
Rate breakdown
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
Import Tips
• Dihydrate form classified with anhydrous acid per Chapter Note 5(F) stabilizer provisions
• Document water content <15% to avoid Chapter 28 inorganic salt classification
• Requires REACH/ TSCA registration verification for US import clearance