Prehnitic Acid from Mexico
Prehnitic acid (benzene-1,2,4,5-tetracarboxylic acid) used in polyimide films and high-performance composites. Identical reactivity to pyromellitic acid but different substitution pattern. HTS 2917.39.70.00 as aromatic polycarboxylic acid, other.
Duty Rate — Mexico → 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
• Synonymous with pyromellitic acid in commerce; position isomers rarely distinguished
• Composite prepreg manufacturers require lot-specific DSC thermal analysis
• Distinguish monomer from Chapter 39 low MW prepolymer by GPC analysis