Tetra-n-propylthiuram Disulfide from Canada
Although primarily organo-sulfur, this thiuram accelerator contains tin impurities making it organo-inorganic under 2931 when tin-carbon bonds present. Falls under HTS 2931.90.90.29 as other organo-tin compounds.
Duty Rate — Canada → 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
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
Import Tips
• Provide elemental analysis showing tin content >1% for 2931 classification justification
• Comply with OSHA 1910.1000 Table Z-1-A exposure limits for thiuram dust
• Avoid Chapter 38 if purity >95%; mixtures go to 3812.10 for rubber accelerators