Unsaturated Polyester Resin (UPR)
Liquid unsaturated polyester resin (UPR) for fiberglass composites in marine and construction applications, supplied in primary form before curing. This polyester is classified under 3907.99.00 as other polyesters, as it is not specifically named in other subheadings and meets the definition of a polyester in primary form. The product is a liquid, which is a primary form under chapter note 6, and is not a composition with additives exceeding 1% by weight.
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 resin is specifically an unsaturated polyester
Unsaturated polyesters have a dedicated subheading under other polyesters.
If the resin is dissolved in volatile solvents exceeding 50% by weight
Solutions in volatile solvents are classified in Chapter 32, not Chapter 39.
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
• Verify the resin is not a solution in volatile organic solvents exceeding 50% by weight, as this would classify under heading 32.08
• Keep safety data sheets and technical specifications to support classification as a polyester
• Ensure the resin is not mixed with curing agents or accelerators, which might change its classification
Related Products under Tariff item 3907.99.00
Bio-based Polyethylene Furanoate (PEF) Granules
Bio-based polyethylene furanoate (PEF) granules are a sustainable polyester from furandicarboxylic acid and ethylene glycol, used for bottles and films. They are in primary forms and qualify as other polyesters under this tariff item since furanoate units predominate.
Celanex PBT Pellets
Celanex® 1600A polybutylene terephthalate (PBT) pellets, a pure resin used for automotive under-hood components and electrical parts. This product is a polyester in primary form, specifically PBT where the butylene terephthalate monomer units contribute 95% or more by weight, meeting the purity standards of subheading note 1. It is classified under tariff item 3907.99.00 as 'other polyesters' not elsewhere specified.
Copolyester Elastomer (COPE) Granules
Thermoplastic copolyester elastomer (COPE) granules, such as Hytrel, combining hard polyester segments with soft polyether segments, supplied in primary granules. These copolymers are classified under 3907.99.00 as other polyesters, as the polyester blocks predominate by weight over the polyether blocks, per chapter note 4. The product is in primary form and not covered by a more specific subheading.
Copolyester Elastomer (COPE) Pellets
Copolyester elastomer (COPE) pellets, like Hytrel, are thermoplastic elastomers combining polyester hard segments with polyether soft segments for hoses and belts. They are in primary forms and qualify as other polyesters where polyester units predominate over polyether units.
High IV Polyester Staple Fiber Resin
High intrinsic viscosity polyester staple fiber resin is specialized polyester chips for staple fiber production, not textile grade PET. It is in primary forms and qualifies as other polyesters under this tariff item with specialized IV greater than 0.70.
Injection Molding Grade PBT Resin
Injection molding grade PBT resin, optimized for high-speed production of thin-walled parts. This polybutylene terephthalate is in primary form (pellets) and meets the definition of a pure polyester under subheading note 1, with butylene terephthalate units contributing at least 95% by weight. It is classified under 3907.99.00 as 'other polyesters' in primary forms.