Gases, petroleum, C3-4, isobutane-rich

CAS 68477-33-8

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$705M

Top sourceCanada 93%

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 271113, 271129 · basket

EPA reports by year

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

These shares come from HS customs code 271113, 271129, which covers 118 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 93%CanadaKR 3%South KoreaCL 2%Chile

China
United Kingdom
Czech Republic
Italy
United Arab Emirates
Poland
Guyana
Turkey
Germany
Philippines
Netherlands
Sweden
Ireland
Belgium
Trinidad and Tobago
Japan

EPA-registered manufacturers (11)

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

Cenovus Energy · CA Canada

Cenovus U.S

Chevron Richmond California Refinery

Chevron Usa

Delek Us Holdings

Show all 11

ExxonMobil

Lima Refining

Marathon Petroleum

Martinez Refining

Pbf Holding

Phillips 66

Domestic parents -- activity not disclosed (1)

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

Shell

Why It Matters

Sectors

Energy

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 Petroleum Refineries (100%)Processing—incorporation into formulation, mixture, or reaction product

Chemical Identity

CAS68477-33-8

PubChem CIDNot recorded

DTXSIDDTXSID8028553

FormulaNot recorded

Mol. WeightNot recorded

SMILESNot recorded

Data Sources

EPA CompTox (DSSTox) · DTXSID8028553Retrieved 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

Gases, petroleum, C3-4, isobutane-rich (CAS 68477-33-8) https://chemicalindependence.com/chemical/68477-33-8/ EPA CompTox (DSSTox): DTXSID8028553. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID8028553 EPA Chemical Data Reporting: 68477-33-8. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 68477-33-8. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 271113,271129 for CAS 68477-33-8. Reporting year: 2024. https://usatrade.census.gov/