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SITCSection 5
U.S. imports of styrene-acrylonitrile (san) copolymers in primary forms (SITC 57291) totaled $6.3M in April 2026, traded with 13 countries.
Importers of Styrene-Acrylonitrile (SAN) Copolymers in Primary Forms paid $700K in duties in April 2026 — an effective duty rate of 14% on $5.2M in dutiable value, based on actual customs collections rather than the published tariff schedule. Styrene-Acrylonitrile (SAN) Copolymers in Primary Forms imports of $6.3M in April 2026 ran 15% above the year-to-date monthly average of $5.5M.
Last updated: April 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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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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| Country | Imports | Exports | Balance |
|---|---|---|---|
| MEXICO | $1.1M | $1.4M | +$233K |
| KOREA, SOUTH | $2.4M | $3K | -$2.4M |
| GERMANY | $1.8M | -- | -$1.8M |
| CANADA | $588 | $1.7M | +$1.7M |
| JAPAN | $684K | $26K | -$658K |
Monthly import values over time