Mellophanic Acid from Japan
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 — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%
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