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SITCSection 5
U.S. imports of styrene-acrylonitrile (san) copolymers in primary forms (SITC 57291) totaled $6.5M in July 2026, traded with 14 countries.
Importers of Styrene-Acrylonitrile (SAN) Copolymers in Primary Forms paid $616K in duties in July 2026 — an effective duty rate of 12% on $5.0M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: July 2026 dataSAN copolymers combine styrene's processability with acrylonitrile's chemical resistance and rigidity, producing a transparent engineering resin used in housewares, laboratory ware, and automotive instrument clusters. As a named copolymer heading, SAN is classified separately from both general polystyrene and ABS, and the acrylonitrile content ratio is the key specification that defines the material and supports correct classification. SAN competes with polycarbonate and acrylic in clarity-critical applications where moderate chemical resistance is required.
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149 shipments/mo
Basic heading 289 of 465 in section 5
Basic heading 57291 · $6.5M of $28.9B
The defining difference is the presence of butadiene rubber in ABS, which gives it impact resistance and opacity. SAN lacks the butadiene component, remaining transparent and more rigid. Customs classification relies on the polymer composition confirmed by the manufacturer's technical data sheet; a material misidentified as SAN when it contains butadiene would be reclassified as ABS.
Housewares (mixing bowls, storage containers), medical and laboratory devices requiring chemical resistance, automotive interior trim, and cosmetic packaging are the primary end-use sectors. Demand tends to track consumer goods manufacturing activity and can shift when buyers substitute polycarbonate or acrylic for specific applications.
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Imports · July 2026
origin
Korea, South and Mexico together supply 79% of it.
customs district
Census does not publish district detail for this classification system.
destination
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$6.5MYoY · Pro
Exports
$5.5MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.