U.S. exports of Other Styrene Polymers in Primary Forms (N.E.S.) (SITC 57299) totaled $52.8M in August 2026.
Importers of Other Styrene Polymers in Primary Forms (N.E.S.) paid $1.6M in duties in August 2026, an average duty rate of 9.41% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: August 2026 dataStyrene-butadiene copolymers, styrene-maleic anhydride resins, and other styrene-based polymers not captured by the named headings for polystyrene, SAN, or ABS are grouped here. Because this is a residual category, classification requires affirmatively ruling out all named styrene polymer headings, and the comonomer identity and ratio are the decisive technical facts. Specialty resins in this group serve niche applications in automotive, packaging, and adhesive markets where tailored thermal or mechanical properties are required.
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416 import shipments a month
A detailed certificate of analysis identifying the comonomer(s), their weight percentages, and the absence of butadiene (which would indicate ABS) or acrylonitrile alone (which would indicate SAN) is essential. A binding ruling from CBP is advisable for novel copolymer formulations to avoid reclassification risk.
Potentially, but the classification depends on whether the material is considered a styrene polymer or a synthetic rubber under the applicable nomenclature rules. Thermoplastic elastomers with high butadiene content may be classified under rubber headings rather than plastics headings. A licensed customs broker should review the specific polymer architecture and composition before import.
Basic heading 101 of 465 in section 5
Basic heading 57299 · $52.8M of $26.2B
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Exports · August 2026
destination
Mexico and China 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
$17.3MYoY · free account
Exports
$52.8MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $194.6M of Other Styrene Polymers in Primary Forms (N.E.S.) and exported $607.2M.
Through August 2026. Source: U.S. Census Bureau.