Polybutylene

CAS 9003-28-5

1-Butene, homopolymer

US productionNot reported

Import value, 2024$178M

Top sourceCanada 20%

EPA exempts this chemical from its production survey.

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

Where It Comes From

Customs basis: HS 390290 · basket

These shares come from HS customs code 390290, which covers 17 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).

CA 20%CanadaIT 17%ItalyKR 15%South KoreaJP 13%JapanNL 8%Netherlands

Malaysia
Kazakhstan
India
United Kingdom
Spain
Sweden
Turkey
United Arab Emirates
Poland
Switzerland
Australia
Portugal
Ireland
Brazil
Denmark
Austria
Senegal

Why It Matters

No EPA sector or FDA product records name a use for this chemical.

Chemical Identity

CAS9003-28-5

PubChem CIDNot recorded

DTXSIDDTXSID00904731

FormulaNot recorded

Mol. WeightNot recorded

SMILESNot recorded

Data Sources

EPA TSCA InventoryRetrieved 2026-10-04
US Census international tradeReporting year: 2024 · Retrieved 2026-10-04

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Brief citations

Polybutylene (CAS 9003-28-5) https://chemicalindependence.com/chemical/9003-28-5/ EPA TSCA Inventory: CAS 9003-28-5. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 390290 for CAS 9003-28-5. Reporting year: 2024. https://usatrade.census.gov/