Dibutyltin Oxide Polyurethane Catalyst from China
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 — China → United States
28.7%
Rate breakdown
9903.88.0425%Except as provided in headings 9903.88.33, 9903.88.34, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(g) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(g)
9903.03.030%Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
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