Polyisobutylene (PIB) Gum from Mexico
Polyisobutylene is a synthetic rubber-like polyolefin from isobutylene monomer, imported as viscous liquid or granules under HTS 3902.90.00 for other olefin polymers in primary forms. It qualifies as the isobutylene units exceed 95% by weight. Commonly used in chewing gum base, adhesives, and sealants.
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
• Declare exact molecular weight and viscosity to distinguish from rubber alternatives; include MSDS for hazardous liquid forms
• Check for plasticizer content if blended, as it affects subheading per notes
• Use refrigerated containers for low-viscosity grades to prevent solidification