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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If higher imide content predominance
Imide monomer exceeds ether units; classified as polyimide-imide per weight rules.
If polycarbonate copolymer
PC copolymers have dedicated subheading taking precedence over 'Other polyethers'.
If machined finished parts
Articles of other plastics in Chapter 39, not primary polymer forms.
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Import Tips & Compliance
• Provide GPC chromatograms showing molecular weight distribution for polymer status
• Avoid set packaging with fittings; 3917 duties apply only with attached components
• Label clearly as industrial resin to dodge household article exclusions in 3924
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.
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.
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.