Polysulfone Pellets USP Grade
USP-grade polysulfone pellets are high-purity polyethers in primary form, featuring diphenyl sulfone ether linkages that exceed 95% polymer content. They are classified under tariff item 3907.29.00 as other polyethers, given their polyether structure and primary pellet form. These pellets are used in medical devices, food contact materials, and water filtration components.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the product is a polysulfone with a different chemical structure, such as polyethersulfone (PES)
Other polymers with sulfur groups may fall under heading 3911, depending on their composition.
If the product is a polyester rather than a polyether
The presence of ester linkages would change the classification to other polyesters.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Ensure the pellets meet USP-grade specifications and provide certificates of analysis to the CBSA
• Confirm that the polyether content exceeds 95% by weight to maintain classification under this tariff item
• Verify compliance with Canadian medical device regulations if used in healthcare applications
Related Products under Tariff item 3907.29.00
Polybutylene Ether Pellets
Polybutylene ether pellets are aliphatic polyethers derived from 1,4-butanediol, presented in primary form as pellets. They consist of repeating ether linkages with over 95% polyether content by weight, classifying them under tariff item 3907.29.00 as other polyethers. These pellets are commonly used as intermediates in hot-melt adhesives and flexible packaging applications.
Polyether Block Amide Pellets
Polyether block amide (PEBA) pellets are thermoplastic elastomers in primary granular form, composed of polyether and polyamide segments. The polyether segments contribute over 95% by weight to the polymer chain, satisfying the classification criteria for other polyethers under tariff item 3907.29.00. These pellets are used in applications requiring flexibility and impact resistance, such as sports footwear and medical tubing.
Polyetherimide Resin Granules
Polyetherimide (PEI) resin granules, such as Ultem, are high-performance aromatic polyethers in primary form. Their imide-ether structure qualifies them as 'other polyethers' under tariff item 3907.29.00, as the polyether monomer content meets the 95% threshold. These granules are used in aerospace, automotive, and high-temperature electrical applications.
Polyoxypropylene Glycol Industrial Grade
Polyoxypropylene glycol (PPG) is an industrial-grade liquid polyether in primary form, with propylene oxide-derived ether linkages comprising over 95% by weight. It is classified under tariff item 3907.29.00 as other polyethers, given its polyether structure and primary liquid state. PPG is widely used as an intermediate in polyurethane foams, coatings, and sealants.
Polyphenylene Ether Resin
Polyphenylene ether (PPE) resin is a high-performance engineering thermoplastic in primary pellet form, consisting of repeating ether linkages from its monomer units. With over 95% polyether content by weight, it falls under tariff item 3907.29.00 as other polyethers. PPE resin is used in automotive parts, electrical components, and appliances due to its heat resistance and dimensional stability.
Polytetramethylene Ether Glycol (PTMEG)
Polytetramethylene ether glycol (PTMEG) is a liquid polyether polyol in primary form, with tetrahydrofuran-derived ether units comprising over 95% by weight. It is classified under tariff item 3907.29.00 as other polyethers, given its polyether structure and liquid state. PTMEG is a key intermediate in the production of spandex fibers, polyurethane elastomers, and copolyester ethers.