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HSChapter 39
U.S. imports of styrene-acrylonitrile (san) copolymers in primary forms (HS 390320) 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 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.
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.
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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 |
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 3903200000 | STYRENE-ACRYLONITRILE (SAN) COPOLYMERS | $6.3M | 13.52% | $700K |
STYRENE-ACRYLONITRILE (SAN) COPOLYMERS
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 3903200000 | STYRENE-ACRYLONITRILE (SAN) COPOLYMERS | $4.1M |
STYRENE-ACRYLONITRILE (SAN) COPOLYMERS
2.0M kg
ARTICLES OF PLASTICS, NESOI
HS 392690
FLOOR, WALL, ETC COVERS, VINYL CHLORIDE POLYMERS
HS 391810
TABLEWARE AND KITCHENWARE OF PLASTICS
HS 392410
SACKS & BAGS (INCL CONES) OF POLYMERS OF ETHYLENE
HS 392321
HOUSEHOLD AND TOILET ARTICLES NESOI OF PLASTICS
HS 392490
PLATES, SHEETS ETC, NON-CELL ETC, POLYMER
HS 392010
Monthly import values over time
| State | Imports | Exports | Balance |
|---|---|---|---|
| Mississippi | -- | $2.2M | +$2.2M |
| Illinois | $1.9M | $256K | -$1.6M |
| Texas | $1.1M | $135K | -$994K |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| PORT HURON, MI | $2K | $1.4M | +$1.4M |
| LAREDO, TX | $259K | $1.1M | +$873K |
| LOS ANGELES, CA | $1.4M | -- | -$1.4M |