Chloroprene

CAS 126-99-8

1,3-Butadiene, 2-chloro-

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$61M

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. 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 290329 · basket

EPA reports by year

2023: 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 (2)

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

Denka Performance Elastomer

Occidental Petroleum

Why It Matters

Sectors

Plastics & 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 2 sectors as 2 functional roles.

•Monomers in Synthetic Rubber Manufacturing (100%)Processing as a reactant
•Intermediate in All Other Basic Organic Chemical ManufacturingProcessing as a reactant

Vendor Pricing

$0.31/gA2B Chem LLC (1 week)

CountryUnited States

Pack$157.00 / 500 g

PurityNot recorded

Vendors5 available

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

4 more vendors

Vendor	Country	$/g	Pack	Purity
AA BLOCKS (1 week)	United States	$0.32	500 g	—
Sigma-Aldrich (Rush Stock)	Germany	$1.55	250 g	85%
Sigma-Aldrich	Germany	$1.55	250 g	85%
Angene Chemical	China → Hong Kong	$1.76	100 g	85%

Chemical Identity

CAS126-99-8

PubChem CIDNot recorded

DTXSIDDTXSID5020316

FormulaC4H5Cl

Mol. Weight88.53 g/mol

SMILESClC(=C)C=C

Data Sources

EPA TSCA InventoryRetrieved 2026-04-29
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

Chloroprene (CAS 126-99-8) https://chemicalindependence.com/chemical/126-99-8/ EPA TSCA Inventory: CAS 126-99-8. Retrieved 2026-04-29. https://www.epa.gov/tsca-inventory EPA Chemical Data Reporting: 126-99-8. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 126-99-8. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 290329 for CAS 126-99-8. Reporting year: 2024. https://usatrade.census.gov/