Diphenic Acid from Mexico
Diphenic acid (2,2'-biphenyldicarboxylic acid) is used in polymer synthesis and as a chiral resolving agent. Although biphenyl-based, classified under HTS 2917.39.70.00 as aromatic polycarboxylic acid per Chapter 29 structure. Provides rigid linker in specialty polymers.
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
• Biphenyl structure confirmed aromatic per Chapter 29; not Chapter 27 hydrocarbon
• Chiral purity documentation required for resolution agent applications
• Distinguish from Chapter 38 optical resolving preparations by purity >98%