Tris(2,4-di-tert-butylphenyl)phosphite from Mexico
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 — Mexico → United States
13.7%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
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