1,4-Benzenedicarbonyl dichloride

CAS 100-20-9

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$316M

Top sourceSouth Korea 19%

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 291739 · basket

EPA reports by year

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

These shares come from HS customs code 291739, which covers 103 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).

KR 19%South KoreaCN 19%ChinaIN 18%IndiaES 13%SpainCA 9%Canada

Netherlands
Malaysia
Colombia
Switzerland
Turkey
Germany
Peru
Brazil
Sweden
Belgium
Denmark
Czech Republic
Ukraine
Hong Kong

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.

K-I Chemical U.S.A

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.

Dupont Specialty Products Usa

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.

•Intermediate in All Other Basic Organic Chemical ManufacturingProcessing as a reactant
•Monomers in Plastics Material and Resin Manufacturing (100%)Processing as a reactant

Vendor Pricing

$0.07/gA2B Chem LLC

CountryUnited States

Pack$33.00 / 500 g

Purity99%

Vendors9 available

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

8 more vendors

Vendor	Country	$/g	Pack	Purity
AA BLOCKS	United States	$0.08	500 g	99%
Sigma-Aldrich (Rush Stock)	Germany	$0.15	1 kg	99%
Sigma-Aldrich	Germany	$0.15	1 kg	99%
ALFA AESAR	Germany	$0.21	250 g	99%
Fluorochem UK	United Kingdom	$1.72	25 g	—
Life Chemicals Inc.	Ukraine → Canada	$16.00	2.5 g	95%
Labotest KG	Germany	$453.00	1000 mg	90%
Otava, Ltd. (2 weeks)	Ukraine	$2724.00	50 mg	90%

Chemical Identity

CAS100-20-9

PubChem CID7488

DTXSIDDTXSID7026653

FormulaC8H4Cl2O2

Mol. Weight203.02 g/mol

SMILESC1=CC(=CC=C1C(=O)Cl)C(=O)Cl

Data Sources

EPA CompTox (DSSTox) · DTXSID7026653Retrieved 2026-04-06
PubChem · compound 7488Retrieved 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

1,4-Benzenedicarbonyl dichloride (CAS 100-20-9) https://chemicalindependence.com/chemical/100-20-9/ EPA CompTox (DSSTox): DTXSID7026653. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID7026653 PubChem: 7488. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/7488 EPA Chemical Data Reporting: 100-20-9. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 100-20-9. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 291739 for CAS 100-20-9. Reporting year: 2024. https://usatrade.census.gov/