Isobutene

CAS 115-11-7

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 (7)

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

Enterprise Products Operating

Lyondell Chemical

Shell Petroleum

Show all 7

Shintech Louisiana

Tpc Group

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.

ExxonMobil

Si Group

Valero Energy

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

EnergyPlastics & RubberConsumer 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 5 sectors as 3 functional roles.

•Intermediate in Petrochemical Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
•Intermediate in All Other Basic Organic Chemical Manufacturing (100%)Processing as a reactant
•Fuel in Petrochemical Manufacturing (100%)Processing as a reactant
•Intermediate in Petroleum Refineries (100%)Processing as a reactant
•Intermediate in Synthetic Rubber Manufacturing (100%)Processing as a reactant
•Monomers in All Other Basic Organic Chemical Manufacturing (100%)Processing as a reactant
•Fuel in Wholesale and Retail Trade (100%)Processing—incorporation into formulation, mixture, or reaction product

Vendor Pricing

$0.46/gSigma-Aldrich (Rush Stock)

CountryGermany

Pack$1653.88 / 3.6 kg

Purity99.5%

Vendors3 available

Prices reflect listed pack sizes. Small research packs run far above bulk rates.

2 more vendors

Vendor	Country	$/g	Pack	Purity
Sigma-Aldrich	Germany	$0.46	3.6 kg	99.5%
Labotest KG	Germany	$453.00	1000 mg	90%

Chemical Identity

CAS115-11-7

PubChem CID8255

DTXSIDDTXSID9020748

FormulaC4H8

Mol. Weight56.11 g/mol

SMILESCC(=C)C

Data Sources

EPA CompTox (DSSTox) · DTXSID9020748Retrieved 2026-04-06
PubChem · compound 8255Retrieved 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

Isobutene (CAS 115-11-7) https://chemicalindependence.com/chemical/115-11-7/ EPA CompTox (DSSTox): DTXSID9020748. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID9020748 PubChem: 8255. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/8255 EPA Chemical Data Reporting: 115-11-7. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 115-11-7. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 290123 for CAS 115-11-7. Reporting year: 2024. https://usatrade.census.gov/