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U.S. imports of styrene-acrylonitrile (san) copolymers in primary forms (HS 390320) 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 the rigidity of polystyrene with the chemical resistance of acrylonitrile, making them a preferred engineering resin for transparent housewares, appliance components, and automotive trim. Classified under a single US tariff line (3903200000), the material enters in primary forms such as pellets or granules. South Korea is the dominant supplier to the US market, with Mexico and Germany also contributing meaningfully to import volumes. Importers sourcing from South Korea benefit from KORUS FTA treatment, while shipments from other origins should be evaluated for applicable duty exposure.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
149 shipments/mo
SAN is a copolymer of styrene and acrylonitrile and is classified under heading 3903.20, distinct from homopolymers of styrene (3903.11/3903.19). The acrylonitrile content gives SAN improved chemical resistance and clarity, which is the defining characteristic that separates it from GPPS or HIPS at the tariff heading level.
To claim preferential treatment under KORUS, importers must have a valid certification of origin (or importer's knowledge) demonstrating that the goods meet the applicable rules of origin, typically a tariff-shift or regional-value-content test. The certification should be retained for at least five years and be available for CBP review upon request.
HSChapter 39
Subheading 4 of 5 in heading 3903
Subheading 390320 · $6.5M of $109.9M
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 3903200000 | Styrene-Acrylonitrile (San) Copolymers | $6.5M | 9.54% | 77.18% | $616K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3903200000 | Styrene-Acrylonitrile (San) Copolymers | $5.5M |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
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ImportsExports
Imports
$6.5MYoY · Pro
Exports
$5.5MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Imports · July 2026
origin
Korea, South and Mexico together supply 79% of it.
customs district
destination
entry
rate provision · imports
22.8% enters free of duty; the effective duty rate is 9.54%.