Polysulfone Pellets USP Grade from Mexico
USP-grade polysulfone pellets are high-purity polyethers in primary form, classified under HTS 3907.29.00.00 due to diphenyl sulfone ether linkages exceeding 95% polymer content. Applied in medical devices and food contact membranes.
Duty Rate — Mexico → United States
16.5%
Rate breakdown
9903.03.0110%Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Import Tips
• Include USP/EP certificates alongside polymer analysis for regulatory clearance
• Specify 'primary granules' in entry docs; extruded sheets shift to 3920.51
• Monitor dimensions if sheet-formed; US note limits free rates for 3921 small articles