Tris(2,4-di-tert-butylphenyl)phosphite from Canada
This sterically hindered phosphite (CAS 31570-04-4) serves as a secondary antioxidant in polymers. Classified HTS 2931.49.00 as non-halogenated organo-phosphorus derivative per Chapter 29 definitions. Three phenolic groups directly bonded to phosphorus atom.
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
• Include polymer stabilizer end-use certification to support Chapter 29 classification
• Provide stabilizer concentration data; >95% pure maintains chemical compound status
• Avoid bulk mixtures classification by ensuring retail packaging under 25kg net weight