Spiro Phosphonate Monomer for Polymer Synthesis from Mexico
This research-grade spiro phosphonate monomer, chemically 3,9-dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane 3,9-dioxide, is used in copolymer production. It qualifies under HTS 2931.48.00.00 for its organo-inorganic phosphorus structure excluding halogens.
Duty Rate — Mexico → United States
13.7%
Rate breakdown
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
• Request Certificate of Analysis (CoA) specifying >98% purity to meet 'chemically defined' criteria
• Segregate from solvents to avoid note (e) issues
• Monitor REACH-like regulations for phosphorus compounds