cis-2-Butene

CAS 590-18-1

U.S. production volumes are classified as confidential business information.

US productionCBI

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

Import value, 2024$286K

Top sourceSouth Korea 61%

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. US production volume is confidential. 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 290123 · narrow

EPA reports by year

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

These shares come from HS customs code 290123, which covers 5 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 61%South KoreaCN 39%China

EPA-registered manufacturers (5)

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

Shell Plc · GB United Kingdom

Shin-Etsu Chemical · JP Japan

Gulf Coast Growth Ventures

Shell Petroleum

Shintech Louisiana

EPA-registered importers (1)

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

Tartan Oil

Why It Matters

Sectors

EnergyConsumer ProductsCore 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 3 sectors as 2 functional roles.

•Intermediate in Petrochemical Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
•Intermediate in Petroleum Refineries (100%)Processing as a reactant
•Fuel in Wholesale and Retail Trade (100%)Processing—incorporation into formulation, mixture, or reaction product

Chemical Identity

CAS590-18-1

PubChem CID5287573

DTXSIDDTXSID0027224

FormulaC4H8

Mol. Weight56.11 g/mol

SMILESCC=CC

Data Sources

EPA CompTox (DSSTox) · DTXSID0027224Retrieved 2026-04-06
PubChem · compound 5287573Retrieved 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

cis-2-Butene (CAS 590-18-1) https://chemicalindependence.com/chemical/590-18-1/ EPA CompTox (DSSTox): DTXSID0027224. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID0027224 PubChem: 5287573. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/5287573 EPA Chemical Data Reporting: 590-18-1. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 590-18-1. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 290123 for CAS 590-18-1. Reporting year: 2024. https://usatrade.census.gov/