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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If supplied as diluted solution or mixture with stabilizers exceeding Chapter 29 limits
Solutions or mixtures not qualifying under Chapter 29 notes (d)-(g) fall into prepared binders or chemical products of heading 3824.
If classified primarily as inorganic tin compound without significant organic component
If tin-carbon bonding doesn't dominate, it may shift to other metal compounds in Chapter 28 rather than organo-inorganic of 2931.
If specifically prepared and put up for paint or varnish use
Organo-tin compounds formulated as driers for paints fall under Chapter 32 synthetic organic products rather than base chemicals.
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Import Tips & Compliance
• Verify chemical purity and provide Certificate of Analysis (CoA) to confirm identity as dibutyltin oxide per Chapter 29 note (a)
• Include Safety Data Sheet (SDS) detailing toxicity; organo-tin compounds require EPA TSCA registration for US import
• Avoid misclassification as mixtures; ensure product meets 'separate chemically defined compound' criteria to prevent reclassification
Related Products under HTS 2931.90.90.21
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.
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).
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.