Standard International Trade Classification
U.S. exports of Saturated Polyesters, Primary Forms (N.E.S.) (SITC 57439) totaled $109.2M in August 2026.
Importers of Saturated Polyesters, Primary Forms (N.E.S.) paid $6.2M in duties in August 2026, an average duty rate of 11.81% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Saturated Polyesters, Primary Forms (N.E.S.) imports of $52.2M in August 2026 ran 12% above the year-to-date monthly average of $46.4M.
Last updated: August 2026 dataSaturated polyesters in primary forms — not elsewhere specified — encompass a broad family of non-reactive thermoplastic resins used in hot-melt adhesives, powder coatings, engineering plastics, and specialty film applications. Unlike their unsaturated counterparts, saturated polyesters do not require a reactive monomer to cure, which simplifies handling and storage but places greater emphasis on molecular weight distribution and melt viscosity as key trade specifications. The N.E.S. scope excludes PET and alkyds, capturing specialty grades such as polybutylene terephthalate (PBT) precursors and copolyester elastomers. Classification disputes can arise when a resin straddles the boundary between a saturated polyester and a polyurethane precursor, so technical polymer characterization data is advisable at entry.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
2.2K import shipments a month
The key chemical distinction is the absence of reactive carbon-carbon double bonds in the polymer backbone of saturated polyesters. Customs authorities may request a certificate of analysis or polymer characterization report (e.g., FTIR spectrum or iodine value) to confirm saturation, particularly when a resin could plausibly be classified under either heading.
Powder coatings manufacturers are among the largest consumers, using saturated polyesters as the primary binder resin. Hot-melt adhesive producers, specialty film extruders, and engineering plastics compounders also source these resins as key intermediates.
Basic heading 52 of 465 in section 5
Basic heading 57439 · $109.2M of $26.2B
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Exports · August 2026
destination
China and Mexico together take 52% of it.
customs district
Census does not publish district detail for this classification system.
origin
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$52.2MYoY · free account
Exports
$109.2MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $539.9M of Saturated Polyesters, Primary Forms (N.E.S.) and exported $1.3B.
Through August 2026. Source: U.S. Census Bureau.