Dibutyltin Oxide Silicone Crosslinker from Mexico
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 — Mexico → United States
110%
Rate breakdown
9903.04.6096.3%Except as provided in heading 9903.04.61, patented pharmaceutical articles as provided for in subdivisions (c) and (d) of U.S. note 40 to this subchapter
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
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