Cyclopentene

CAS 142-29-0

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$90M

Top sourceJapan 21%

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 290219 · basket

EPA reports by year

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

These shares come from HS customs code 290219, which covers 108 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).

JP 21%JapanBR 12%BrazilTW 12%TaiwanKR 11%South KoreaDE 9%Germany

Russia
United Kingdom
Indonesia
South Africa
Ukraine
Madagascar
Hungary
Hong Kong
Czech Republic
Israel

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.

Gulf Coast Growth Ventures

The Goodyear Tire & Rubber

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.

Eastman Chemical

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

•Intermediate in Petrochemical Manufacturing (100%)Processing as a reactant

Vendor Pricing

$5.96/gA2B Chem LLC (1 week)

CountryUnited States

Pack$149.00 / 25 g

Purity95%

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	$9.96	25 g	98%
Labotest KG	Germany	$217.80	5000 mg	90%
Otava, Ltd.	Ukraine	$2280.00	50 mg	95%
Otava, Ltd. (2 weeks)	Ukraine	$2724.00	50 mg	95%

Chemical Identity

CAS142-29-0

PubChem CID8882

DTXSIDDTXSID6029171

FormulaC5H8

Mol. Weight68.12 g/mol

SMILESC1CC=CC1

Data Sources

EPA CompTox (DSSTox) · DTXSID6029171Retrieved 2026-04-06
PubChem · compound 8882Retrieved 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

Cyclopentene (CAS 142-29-0) https://chemicalindependence.com/chemical/142-29-0/ EPA CompTox (DSSTox): DTXSID6029171. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID6029171 PubChem: 8882. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/8882 EPA Chemical Data Reporting: 142-29-0. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 142-29-0. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 290219 for CAS 142-29-0. Reporting year: 2024. https://usatrade.census.gov/