2,3-Dichloro-1,3-butadiene

CAS 1653-19-6

Used in 3 industrial sectors tracked by the EPA.

US production1.8M lb

Import value, 2024$61M

Import volumeCBI

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

Top sourceChina 56%

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. 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 290329 · basket

EPA reports by year

2023: US production 1.8M lb · Imports Confidential
2019: US production Confidential · Imports Confidential

These shares come from HS customs code 290329, which covers 39 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).

CN 56%ChinaDE 26%GermanyCZ 9%Czech RepublicMY 3%MalaysiaJP 3%Japan

Mexico
India
South Korea

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.

Denka Performance Elastomer

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.

Parker-Hannifin

Why It Matters

Sectors

ConstructionPlastics & RubberCore 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 4 sectors as 3 functional roles.

•Monomers in All Other Basic Organic Chemical Manufacturing (4%)Processing—repackaging
•Monomers in Synthetic Rubber Manufacturing (96%)Processing as a reactant
•Plasticizer in Adhesive Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
•Adhesion/cohesion promoter in Rubber Product Manufacturing (100%)Processing—incorporation into article

Chemical Identity

CAS1653-19-6

PubChem CID15447

DTXSIDDTXSID1027423

FormulaC4H4Cl2

Mol. Weight122.98 g/mol

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

Data Sources

EPA CompTox (DSSTox) · DTXSID1027423Retrieved 2026-04-06
PubChem · compound 15447Retrieved 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

2,3-Dichloro-1,3-butadiene (CAS 1653-19-6) https://chemicalindependence.com/chemical/1653-19-6/ EPA CompTox (DSSTox): DTXSID1027423. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID1027423 PubChem: 15447. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/15447 EPA Chemical Data Reporting: 1653-19-6. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 1653-19-6. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 290329 for CAS 1653-19-6. Reporting year: 2024. https://usatrade.census.gov/