Hydrocarbons, C4-unsatd.

CAS 68956-54-7

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$358M

Top sourceCanada 98%

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 271114 · basket

EPA reports by year

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

These shares come from HS customs code 271114, which covers 15 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 98%CanadaMX 2%Mexico

Italy
China
Japan
Austria

EPA-registered manufacturers (2)

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

Delek Us Holdings

Dow Chemical

Domestic parents -- activity not disclosed (2)

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

Eastman Chemical

ExxonMobil

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.

Chevron Usa

Why It Matters

Sectors

Core 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

•Intermediate in All Other Basic Organic Chemical ManufacturingProcessing as a reactant

Chemical Identity

CAS68956-54-7

PubChem CIDNot recorded

DTXSIDDTXSID2028935

FormulaNot recorded

Mol. WeightNot recorded

SMILESNot recorded

Data Sources

EPA CompTox (DSSTox) · DTXSID2028935Retrieved 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

Hydrocarbons, C4-unsatd. (CAS 68956-54-7) https://chemicalindependence.com/chemical/68956-54-7/ EPA CompTox (DSSTox): DTXSID2028935. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID2028935 EPA Chemical Data Reporting: 68956-54-7. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 68956-54-7. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 271114 for CAS 68956-54-7. Reporting year: 2024. https://usatrade.census.gov/