Dibutyltin Oxide Polyurethane Catalyst from Mexico
Specialty dibutyltin oxide formulation optimized for polyurethane foam production, acting as gelling and blowing catalyst. Falls under HTS 2931.90.90.21 as the pure organo-tin compound before formulation into end-use mixtures. Excluded from Chapter 38 as it's a separate chemically defined compound per Chapter 29 note (a).
Duty Rate — Mexico → United States
100%
Rate breakdown
9903.04.6096.3%Pharmaceuticals Annex IV: patented pharma articles — 100% floor rate
9903.05.900%Articles already subject to Section 232 (steel/aluminum/copper + derivatives, autos + parts, wood, medium/heavy vehicles + parts, semiconductors, patented pharma) — U.S. note 52(f)
Import Tips
• Label with exact CAS number 818-08-6 and concentration to avoid mixture classification challenges
• Comply with IMDG/UN packaging for toxic solids (UN2788); improper packaging risks customs delays
• Maintain batch traceability; impurities >1% may trigger reclassification under Chapter 38 provisions