Unsaturated Polyester Resin for Fiberglass from Mexico
A liquid unsaturated polyester resin in primary form used as a base for composite materials in boat hulls and automotive parts. It falls under HTS 3907.91.5000 as an unsaturated polyester, not specifically named elsewhere, meeting the subheading note for polymers where the monomer units predominate by weight. Supplied in drums for industrial compounding with fiberglass reinforcement.
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
• Verify monomer composition exceeds 95% for the predominant unit per subheading notes to avoid reclassification; provide supplier certificates of analysis for Customs; watch for solidification indicating non-primary form