Mellophanic Acid from Mexico
Mellophanic acid (benzene-1,2,3,5-tetracarboxylic acid) serves as a monomer for heat-resistant polymers and electronic materials. Classified HTS 2917.39.70.00 as aromatic polycarboxylic acid with unsymmetrical substitution. Enables cross-linked network structures.
Duty Rate — Mexico → United States
16.5%
Rate breakdown
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Isomer-specific HPLC method validation required vs pyromellitic acid
• Electronic grade requires <10ppm metal impurities certification
• Chapter 29 requires >95% purity; lower grades become Chapter 38 preparations