Standard International Trade Classification
U.S. exports of Petroleum Resins, Coumarone-Indene Resins, Polyterpenes, Polysulfides, Polysulfones & Other Plastics N.E.S. in Primary Forms (SITC 57596) totaled $89.0M in August 2026.
Importers of Petroleum Resins, Coumarone-Indene Resins, Polyterpenes, Polysulfides, Polysulfones & Other Plastics N.E.S. in Primary Forms paid $8.9M in duties in August 2026, an average duty rate of 13.45% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Petroleum Resins, Coumarone-Indene Resins, Polyterpenes, Polysulfides, Polysulfones & Other Plastics N.E.S. in Primary Forms imports of $66.5M in August 2026 ran 17% above the year-to-date monthly average of $56.8M.
Last updated: August 2026 dataPetroleum hydrocarbon resins — produced by polymerizing C5 and C9 fractions from steam cracking — along with coumarone-indene resins, polyterpenes, polysulfides, and polysulfones, form a commercially diverse group of specialty polymers used as tackifiers in adhesives, modifiers in rubber compounding, and performance additives in coatings and road-marking materials. Polysulfones, including polyethersulfone (PES) and polyphenylsulfone (PPSU), are high-performance engineering thermoplastics used in filtration membranes, medical sterilization equipment, and aerospace components. The breadth of this NES grouping means that the specific resin chemistry — aliphatic versus aromatic, C5 versus C9, sulfone backbone type — is critical for both classification accuracy and end-use specification matching.
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1.5K import shipments a month
C5 aliphatic resins are derived from the piperylene and isoprene fractions of steam cracker output and are valued for their light color and compatibility with EVA and natural rubber in hot-melt adhesives. C9 aromatic resins come from the vinyltoluene and indene fractions and offer higher softening points and better compatibility with SBS and SIS block copolymers. Both fall within this heading, but buyers specify the fraction type precisely because the two are not interchangeable in most adhesive formulations.
Polysulfones — including PES and PPSU grades — offer continuous-use temperatures well above those of standard engineering plastics, along with inherent hydrolytic stability and transparency, making them suitable for repeated steam sterilization cycles in medical and food-processing equipment. These performance attributes command significant price premiums over commodity resins, and importers should document the specific polymer grade and application to support classification and justify valuation.
Basic heading 65 of 465 in section 5
Basic heading 57596 · $89.0M of $26.2B
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Exports · August 2026
destination
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
$66.5MYoY · free account
Exports
$89.0MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $642.4M of Petroleum Resins, Coumarone-Indene Resins, Polyterpenes, Polysulfides, Polysulfones & Other Plastics N.E.S. in Primary Forms and exported $1.0B.
Through August 2026. Source: U.S. Census Bureau.