Polybutylene Terephthalate (PBT) Resin
Polybutylene terephthalate (PBT) is a thermoplastic polyester resin in primary pellet form used for injection molding in automotive and electrical components. It falls under HTS 3907.99.5050 as 'other polyesters, other' because PBT is a polyester where terephthalic acid and butanediol monomers predominate by weight, not specifically named elsewhere in the heading.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If copolymer with >5% polyamide monomers
Copolymers not meeting 95% polyester monomer threshold classify under Chapter 39 polyamides per subheading note (a)(4).
If for polyethylene terephthalate (PET) specifically
PET with 95%+ ethylene glycol/terephthalic acid monomers falls under specific subheading 3907.61, not 'other'.
If dissolved in solvent as solution
Polymer solutions in organic solvents classify as petroleum products, not primary form polymers in Chapter 39.
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Import Tips & Compliance
• Obtain detailed monomer composition certificates to confirm predominant monomer for polyester classification under subheading notes
• Ensure primary form (pellets/resin) documentation; finished articles shift to Chapter 39 headings like 3926
• Verify no chemical modification exceeding base polymer to avoid 'Other' subheading misclassification
Related Products under HTS 3907.99.50.50
Polytrimethylene Terephthalate (PTT) Pellets
PTT resin pellets are a polyester produced from terephthalic acid and 1,3-propanediol, used in textiles and engineering plastics. Classified in 3907.99.5050 as it qualifies as 'other polyesters' where the ester monomers predominate by weight over other units.
Unsaturated Polyester Resin (UPR)
Liquid unsaturated polyester resin for fiberglass composites in marine and construction applications, supplied in primary form before curing. It enters HTS 3907.99.5050 as 'other polyesters' per predominant dicarboxylic acid/diol monomer content per subheading note (a).
Polycaprolactone (PCL) Thermoplastic Pellets
Biodegradable polyester polycaprolactone resin in pellet form for 3D printing and adhesives. Falls under 3907.99.5050 as other polyesters with caprolactone as predominant repeating unit forming ester linkages.
Polyhydroxyalkanoate (PHA) Biopolymer Resin
PHA is a family of bio-based polyesters from bacterial fermentation, used in packaging films, in primary pellet form. Classified HTS 3907.99.5050 as other polyesters based on hydroxyalkanoic acid monomer units forming ester bonds predominating by weight.
Polyadipate Ester Resin Pellets
Polyadipate polyesters from adipic acid and diols, used as plasticizers and in polyurethane production, imported as primary pellets. HTS 3907.99.5050 covers these as other polyesters meeting predominant monomer criteria.
Copolyester Elastomer (COPE) Granules
Thermoplastic copolyester elastomers like Hytrel, combining hard polyester segments with soft polyether, supplied in primary granules. 3907.99.5050 applies as polyester blocks predominate by weight per classification notes.