Polysulfone Pellets USP Grade from Japan
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 — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of Japan, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 12.5 percent, as provided for in U.S. note 52 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