Prehnitic Acid from Germany
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 — Germany → United States
10%
Rate breakdown
9903.05.3910%Section 301 (forced labor) — European Union member state (col1 rate < 10 percent): MFN < 10% → total duty capped at 10%
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