Phthalic Anhydride Fumaric Coproduct from Mexico
Fumaric acid obtained as byproduct from phthalic anhydride production via aromatic hydrocarbon oxidation processes. Falls under 2917.19.1500 due to aromatic derivation and acyclic polycarboxylic acid structure. Used in unsaturated polyester resins and food acidulant applications.
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
• Include process flow diagrams showing aromatic feedstock usage in CBP documentation
• Test for trans-butenedioic acid purity (>99%) to confirm classification as fumaric acid
• Declare any residual aromatic impurities to avoid hazardous material shipping requirements