Acetic acid, 2-chloro-, ethenyl ester

CAS 2549-51-1

Companies reported imports and no US production of this chemical to EPA for 2023.

US productionZero

Import value, 2024$72M

Import volume31.0K lb

Import dependency100%

Top sourceGermany 40%

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.

Acetic acid, 2-chloro-, ethenyl ester · US import value by year

2013: $42M · Peak 2022: $112M · 2024: $72M · 2025: $65M

Where It Comes From

Customs basis: HS 291540 · basket

EPA reports by year

2023: US production Zero · Imports 31.0K lb
2019: US production Zero · Imports 31.0K lb

These shares come from HS customs code 291540, which covers 17 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).

DE 40%GermanyNL 39%NetherlandsCN 7%ChinaIN 6%IndiaPL 4%Poland

Belgium
Japan
Mexico
Hong Kong

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.

Phibro Animal Health

Why It Matters

Sectors

Plastics & Rubber

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

•Monomers in Rubber Product Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product

Vendor Pricing

$0.54/gA2B Chem LLC

CountryUnited States

Pack$268.00 / 500 g

Purity98%

Vendors5 available

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

4 more vendors

Vendor	Country	$/g	Pack	Purity
AK Scientific, Inc.	United States	$0.71	500 g	99%
AA BLOCKS	United States	$1.37	100 g	98%
AstaTech, Inc	United States	$1.98	100 g	95%
ALFA AESAR	Germany	$3.70	50 g	99%

Chemical Identity

CAS2549-51-1

PubChem CID82156

DTXSIDDTXSID0062509

FormulaC4H5ClO2

Mol. Weight120.53 g/mol

SMILESC=COC(=O)CCl

Data Sources

EPA CompTox (DSSTox) · DTXSID0062509Retrieved 2026-04-06
PubChem · compound 82156Retrieved 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

Acetic acid, 2-chloro-, ethenyl ester (CAS 2549-51-1) https://chemicalindependence.com/chemical/2549-51-1/ EPA CompTox (DSSTox): DTXSID0062509. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID0062509 PubChem: 82156. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/82156 EPA Chemical Data Reporting: 2549-51-1. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 2549-51-1. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 291540 for CAS 2549-51-1. Reporting year: 2024. https://usatrade.census.gov/