Unsaturated Polyester Resin (Non-specific) Flakes from Mexico
UPR flakes for composites beyond standard aromatic types, with maleic anhydride and diols. 3907.99.50 as other polyesters not fitting 3907.99.10 criteria.
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
• Distinguish from 3907.99.10 via acid type certificate; styrene-free declaration if applicable; acid value testing required