Dibutyltin Oxide Polyurethane Catalyst
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).
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If imported as biodiesel production catalyst preparation
Biodiesel processing aids containing organo-tins are classified as chemical preparations in 3826.
If containing sugar esters as stabilizers
Products with sugar derivatives fall under heading 2940 per Chapter 29 note (c), taking precedence.
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Import Tips & Compliance
• 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
Related Products under HTS 2931.90.90.21
Dibutyltin Oxide (DBTO)
Dibutyltin oxide is a white, solid organo-tin compound used primarily as a catalyst in the production of polyurethanes and silicones. It falls under HTS 2931.90.90.21 as an organo-inorganic compound containing tin directly linked to carbon atoms, specifically classified within organo-tin compounds. This chemically defined compound meets Chapter 29 note (a) for separate organic compounds.
High Purity Dibutyltin Oxide Catalyst
High purity grade (>99%) dibutyltin oxide used in esterification and transesterification reactions in fine chemical manufacturing. Classified under HTS 2931.90.90.21 as a specific organo-tin compound per the statistical suffix. Meets Chapter 29 requirements for chemically defined compounds with tin directly linked to carbon.
Technical Grade Dibutyltin Oxide
Technical grade dibutyltin oxide (95-98% purity) for industrial silicone curing applications. HTS 2931.90.90.21 classification applies to this organo-inorganic tin compound despite minor impurities, as it remains a separate chemically defined compound under Chapter 29 note (a).
Dibutyltin Oxide Silicone Crosslinker
Dibutyltin oxide serving as heat-activated crosslinker in RTV silicone sealants and adhesives. Classified in HTS 2931.90.90.21 as pure organo-tin compound, distinct from formulated sealant products. Direct tin-carbon bonds qualify it as organo-inorganic per Chapter 29 heading 2931 definition.