1,1,2,2-Tetrachloroethane

CAS 79-34-5

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$26M

Top sourceBrazil 54%

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 290319 · basket

EPA reports by year

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

These shares come from HS customs code 290319, which covers 47 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).

BR 54%BrazilDE 30%GermanyCN 10%ChinaIN 6%India

Malaysia
United Kingdom
Czech Republic
Switzerland
Japan
Netherlands
Ukraine

EPA-registered manufacturers (1)

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

Occidental Petroleum

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

CAS79-34-5

PubChem CID6591

DTXSIDDTXSID7021318

FormulaC2H2Cl4

Mol. Weight167.8 g/mol

SMILESC(C(Cl)Cl)(Cl)Cl

Data Sources

EPA CompTox (DSSTox) · DTXSID7021318Retrieved 2026-04-06
PubChem · compound 6591Retrieved 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

1,1,2,2-Tetrachloroethane (CAS 79-34-5) https://chemicalindependence.com/chemical/79-34-5/ EPA CompTox (DSSTox): DTXSID7021318. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID7021318 PubChem: 6591. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/6591 EPA Chemical Data Reporting: 79-34-5. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 79-34-5. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 290319 for CAS 79-34-5. Reporting year: 2024. https://usatrade.census.gov/