3,9-Dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane 3,9-dioxide from Canada
This is a specific non-halogenated organo-phosphorus compound featuring a spirocyclic structure with two phosphonate groups, classified under HTS 2931.48.00.00 as an organo-inorganic compound where phosphorus is directly linked to carbon. It is used primarily as a synthetic intermediate in pharmaceutical and agrochemical production.
Duty Rate — Canada → United States
13.7%
Rate breakdown
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 detailed chemical analysis and purity certificates to confirm classification under Chapter 29 note (a) for separate chemically defined compounds
• Verify no halogenation to avoid misclassification into earlier headings
• Include safety data sheets (SDS) for hazardous material handling during customs clearance