2931.90.90.21/Dibutyltin Oxide Polyurethane Catalyst/Mexico

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

3.7%

Rate breakdown

9903.03.030%Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter

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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