</>Build with Tariff Intelligence|Programmatic access to tariff calculations and HS code classification.Explore Developer Resources →

Dibutyltin Oxide Silicone Crosslinker from Canada

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.

Duty Rate — Canada → United States

13.7%

Rate breakdown

9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada

Import Tips

Provide reaction mechanism documentation showing catalytic function to distinguish from polymer additives

Ensure <0.1% heavy metal contaminants to meet silicone industry specifications and avoid 3824 classification

Declare exact particle size distribution; nano-grade may trigger additional nanomaterial reporting