Phosflex 71B Flame Retardant from Mexico
Phosflex 71B is a commercial grade bis(polyoxyethylene) methylphosphonate used as a low-viscosity reactive flame retardant. It falls under HTS 3907.21.00.00 as it matches the specific polyether phosphonate structure in primary liquid form. Commonly incorporated into polyurethane foams and coatings during manufacturing.
Duty Rate — Mexico → United States
16.5%
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
• Provide manufacturer's specification confirming BPEMP content meets HTS naming criteria (95%+ by weight)
• Declare as 'primary form polyether' not finished product to prevent reclassification under Chapter 38
• Check TSCA registration for US import; non-compliant chemicals face seizure