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SITCSection 5
U.S. imports of non-expansible polystyrene in primary forms (SITC 57219) totaled $6.7M in April 2026, traded with 24 countries.
Importers of Non-Expansible Polystyrene in Primary Forms paid $421K in duties in April 2026 — an effective duty rate of 9.8% on $4.3M in dutiable value, based on actual customs collections rather than the published tariff schedule. Non-Expansible Polystyrene in Primary Forms imports of $6.7M in April 2026 ran 31% above the year-to-date monthly average of $5.1M.
Last updated: April 2026 dataGeneral-purpose and high-impact polystyrene (GPPS and HIPS) in pellet or granule form fall under this heading, covering the broad category of polystyrene resins that do not contain a blowing agent. GPPS offers optical clarity for packaging and display applications, while HIPS — rubber-toughened with polybutadiene — serves appliance housings, refrigerator liners, and consumer electronics enclosures. The distinction between GPPS and HIPS is commercially significant but does not create a separate SITC subdivision at this level.
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At the SITC 5-digit level, both GPPS and HIPS fall within this heading as non-expansible polystyrene. At the HTS 10-digit level, however, subdivisions may distinguish them, so importers should verify the applicable tariff line based on the resin's rubber modifier content and consult a customs broker for precise duty determination.
A manufacturer's certificate of analysis or technical data sheet confirming the absence of incorporated blowing agents is standard. If the resin is a copolymer or blend, the comonomer identity should also be documented to confirm it does not belong in a more specific styrene copolymer heading.
Monthly import values over time
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