1,3-Butadiene-styrene copolymer

CAS 9003-55-8

EPA’s 2023 records show zero U.S. production of this chemical.

US productionZero

Import value, 2024$543M

Import volumeCBI

Confidential Business Information. The EPA withholds this volume because publishing it could reveal the reporting company's trade secrets.

Top sourceSouth Korea 27%

At least one company claimed its 2023 production or import volume for this chemical as confidential, so EPA withholds it.

Why supply is unknown

Production is reported production, not a complete census of factories. Production reporting year: 2023. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 390290, 390390 · basket

EPA reports by year

2023: US production Zero · Imports Confidential
2019: US production Confidential · Imports Confidential

These shares come from HS customs code 390290, 390390, which covers 25 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries

Country of origin for US imports, from Census customs data (2024).

KR 27%South KoreaMX 18%MexicoJP 10%JapanCA 8%CanadaIT 7%Italy

Austria
United Kingdom
Romania
Sweden
India
Czech Republic
Brazil
Argentina
Finland
Colombia
Kazakhstan
Dominican Republic
Turkey
Switzerland
Portugal
Greece
United Arab Emirates
Poland
Australia
Egypt
Ireland
Slovenia
Norway
Denmark
Senegal
Guatemala
Philippines

Domestic parents -- activity not disclosed (3)

EPA records name a US company for this chemical but do not disclose whether the company made it here or imported it.

Cellmark Basic Materials

Target

Toyo Tire North America Manufacturing

EPA-registered importers (3)

Companies that report making or importing this chemical to the EPA. Registration is US-centric and does not indicate import origin.

Cie Gen Des Ets Michelin · FR France

Flow Polymers

Michelin

Why It Matters

Sectors

ConstructionPlastics & RubberPaints & CoatingsCore Chemicals

Downstream UsesNot recorded

FDA Shortage Status

Whether any manufacturer currently reports this drug as in shortage on the FDA Drug Shortages database. "Active Shortage" means at least one presentation has status "current."

No FDA shortage records

Industrial Uses

Used in 4 sectors as 3 functional roles.

•Filler in All Other Chemical Product and Preparation Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
•Waterproofing agent in Adhesive Manufacturing (20%)Processing—incorporation into formulation, mixture, or reaction product
•Heat transferring agent in Asphalt Paving, Roofing, and Coating Materials Manufacturing (50%)Processing—incorporation into formulation, mixture, or reaction product
•Waterproofing agent in Paint and Coating Manufacturing (25%)Processing—incorporation into formulation, mixture, or reaction product

Chemical Identity

CAS9003-55-8

PubChem CIDNot recorded

DTXSIDDTXSID0049654

FormulaNot recorded

Mol. WeightNot recorded

SMILESNot recorded

Data Sources

EPA CompTox (DSSTox) · DTXSID0049654Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
US Census international tradeReporting year: 2024 · Retrieved 2026-10-04

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Brief citations

1,3-Butadiene-styrene copolymer (CAS 9003-55-8) https://chemicalindependence.com/chemical/9003-55-8/ EPA CompTox (DSSTox): DTXSID0049654. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID0049654 EPA Chemical Data Reporting: 9003-55-8. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 9003-55-8. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 390290,390390 for CAS 9003-55-8. Reporting year: 2024. https://usatrade.census.gov/