Polysulfone Pellets USP Grade
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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If petroleum sulfonate copolymer
Petroleum resins with sulfonates classified in 3911, different polymer series.
If alkyd-modified polysulfone
Polyester modifications follow alkyd subheading per predominant comonomer.
If pre-formed medical profiles
Finished non-cellular sheets/plates of other plastics, not primary forms.
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Import Tips & Compliance
• 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
Related Products under HTS 3907.29.00.00
Polyphenylene Ether Resin
Polyphenylene ether (PPE) resin is a high-performance engineering thermoplastic in primary pellet form, classified under HTS 3907.29.00.00 as 'other polyethers' because it consists of repeating ether linkages from its monomer units exceeding 95% by weight. It is used in automotive parts and electronics for its heat resistance.
Polyether Block Amide Pellets
Polyether block amide (PEBA) is a thermoplastic elastomer in primary granular form, falling under HTS 3907.29.00.00 as other polyethers where the polyether segments contribute over 95% by weight to the polymer chain. Commonly used in sports shoe midsoles and medical tubing.
Polytetramethylene Ether Glycol (PTMEG)
PTMEG is a liquid polyether polyol in primary form, classified in HTS 3907.29.00.00 as other polyethers with tetrahydrofuran-derived ether units comprising over 95% by weight. It serves as a key intermediate for spandex fibers and polyurethane elastomers.
Polyoxypropylene Glycol Industrial Grade
Industrial-grade polyoxypropylene glycol (PPG) in primary liquid form is an other polyether under HTS 3907.29.00.00, featuring propylene oxide-derived ether linkages over 95% by weight. Used in polyurethane foams, coatings, and brake fluids.
Polyetherimide Resin Granules
Polyetherimide (PEI) granules like Ultem are aromatic polyethers in primary form under HTS 3907.29.00.00, with imide-ether structures meeting the 95% polyether monomer requirement. Ideal for aerospace and high-temp electronics.
Polybutylene Ether Pellets
Polybutylene ether pellets are aliphatic polyethers derived from 1,4-butanediol, classified in HTS 3907.29.00.00 as other polyethers with >95% ether content by weight in primary form. Used in hot-melt adhesives and flexible tubing.