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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

9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico

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