Polystyrene, expandable (HS 390311)
Polystyrene, expandable (HS 390311) has 15,424 U.S. import bill-of-lading shipment records between Aug 2019 and Jul 2026. The largest U.S. importer of Polystyrene, expandable is PACIFIC HIGH TECH USA INC, with 763 shipments, followed by WINSTON PRODUCTS LLC and JENNMAR CORP. The leading supplier is AUGUST AMBER HK LIMITED, with 3,319 shipments, followed by MING DIH INDUSTRIAL CO LTD and STYROPEK MEXICO S A DE C V. Goods originate mainly from CHINA and TAIWAN, arriving primarily at LONG BEACH, CA. Import volume has risen over the past 12 months versus the prior year.
Sourced from U.S. Customs bill of lading data · Updated monthly · Data through July 2026
Shipments over time (last 24 months)
Trade flow: top suppliers → U.S. importers
The strongest supplier-importer relationships for Polystyrene, expandable (HS 390311), by shipment volume. Hover a ribbon for details; click a name to open its profile.
The largest relationship is MING DIH INDUSTRIAL CO LTD → PACIFIC HIGH TECH USA INC with 758 shipments, followed by SSAB EMEA AB → JENNMAR CORP (351) and XIN LONG GUANG PLASTICS CO LTD → CARLISLE CONSTRUCTION MATERIALS DBA (212).
Top U.S. importers
| Importer | Shipments |
|---|---|
| PACIFIC HIGH TECH USA INC | 763 |
| WINSTON PRODUCTS LLC | 520 |
| JENNMAR CORP | 355 |
| CKF INC | 235 |
| MUEHLSTEIN 10 WESTPORT | 214 |
Top suppliers
| Supplier | Shipments |
|---|---|
| AUGUST AMBER HK LIMITED | 3,319 |
| MING DIH INDUSTRIAL CO LTD | 990 |
| STYROPEK MEXICO S A DE C V | 689 |
| XIN LONG GUANG PLASTICS CO LTD | 579 |
| SSAB EMEA AB | 457 |
Origin countries
| Country | Shipments |
|---|---|
| CHINA | 6,975 |
| TAIWAN | 2,048 |
| REPUBLIC OF KOREA | 1,786 |
| MEXICO | 1,265 |
| SWEDEN | 402 |
| VIET NAM | 386 |
| BAHAMAS | 372 |
| CANADA | 254 |
| GERMANY | 231 |
| SPAIN | 217 |
Ports of unlading
| U.S. port | Shipments |
|---|---|
| LONG BEACH, CA | 4,463 |
| LOS ANGELES, CA | 2,483 |
| NEW YORK/NEWARK AREA, NEWARK, NJ | 1,560 |
| TACOMA, WA | 1,322 |
| HOUSTON, TX | 1,073 |
| SEATTLE, WA | 683 |
| MOBILE, AL | 587 |
| SAVANNAH, GA | 523 |
| CHARLESTON, SC | 434 |
| OAKLAND, CA | 430 |
Harmonized System classification
HS code 390311 — Polystyrene, expandable. The Harmonized System is the international standard for classifying traded goods; U.S. Customs records this 6-digit code on every bill of lading.
Not sure this is the right code? Search all 5,700+ subheadings with the free HS code lookup, or see which product categories are growing in our quarterly State of U.S. Imports reports.
Frequently asked questions about importing Polystyrene, expandable
Who imports Polystyrene, expandable (HS 390311)?
Based on U.S. Customs bill-of-lading records, the top U.S. importers of Polystyrene, expandable include PACIFIC HIGH TECH USA INC, WINSTON PRODUCTS LLC, JENNMAR CORP, CKF INC, and MUEHLSTEIN 10 WESTPORT.
Who is the largest U.S. importer of Polystyrene, expandable?
PACIFIC HIGH TECH USA INC is the largest U.S. importer of Polystyrene, expandable (HS 390311), with 763 bill-of-lading shipment records.
Who are the top suppliers of Polystyrene, expandable?
Leading suppliers shipping Polystyrene, expandable (HS 390311) to the U.S. include AUGUST AMBER HK LIMITED, MING DIH INDUSTRIAL CO LTD, STYROPEK MEXICO S A DE C V, XIN LONG GUANG PLASTICS CO LTD, and SSAB EMEA AB.
How many U.S. shipments of Polystyrene, expandable are there?
ImportDoor has 15,424 U.S. import shipment records under HS code 390311, spanning Aug 2019 to Jul 2026.
Where is Polystyrene, expandable imported from?
Polystyrene, expandable is imported into the U.S. primarily from CHINA, TAIWAN, and REPUBLIC OF KOREA.
Find Polystyrene, expandable importers & suppliers
Get the complete list of U.S. importers and global suppliers for HS 390311, with contact details and container-level shipment records on ImportDoor.
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