Diallyl isophthalate

CAS 1087-21-4

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

US productionZero

Import value, 2024$316M

Import volume87.3K lb

Import dependency100%

Top sourceSouth Korea 19%

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.

Diallyl isophthalate · US import value by year

2013: $142M · Peak 2022: $363M · 2024: $316M · 2025: $288M

Where It Comes From

Customs basis: HS 291739 · basket

EPA reports by year

2023: US production Zero · Imports 87.3K lb
2019: US production Zero · Imports 174.7K lb

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

EPA-registered importers (2)

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

Sojitz · JP Japan

Sojitz Corporation Of America

Why It Matters

Sectors

Paints & Coatings

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 Paint and Coating Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product

Vendor Pricing

$0.10/gAaron Chemicals LLC

CountryHong Kong

Pack$49.00 / 500 g

Purity98%

Vendors10 available

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

9 more vendors

Vendor	Country	$/g	Pack	Purity
A2B Chem LLC	United States	$0.10	500 g	98%
AA BLOCKS	United States	$0.11	500 g	99%
Angene Chemical	China → Hong Kong	$0.11	500 g	98%
AK Scientific Specialized	United States	$0.15	500 g	97%
AK Scientific, Inc.	United States	$0.20	500 g	99%
Combi-Blocks, Inc.	United States	$0.25	1 kg	98%
Angene International Limited	United States	$0.38	500 g	99%
AstaTech (2 weeks)	United States	$1.76	25 g	95%
Angene	China → Hong Kong	$4266.67	30 mg	98%

Chemical Identity

CAS1087-21-4

PubChem CID66183

DTXSIDDTXSID7051559

FormulaC14H14O4

Mol. Weight246.26 g/mol

SMILESC=CCOC(=O)C1=CC(=CC=C1)C(=O)OCC=C

Data Sources

EPA CompTox (DSSTox) · DTXSID7051559Retrieved 2026-04-06
PubChem · compound 66183Retrieved 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

Diallyl isophthalate (CAS 1087-21-4) https://chemicalindependence.com/chemical/1087-21-4/ EPA CompTox (DSSTox): DTXSID7051559. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID7051559 PubChem: 66183. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/66183 EPA Chemical Data Reporting: 1087-21-4. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 1087-21-4. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 291739 for CAS 1087-21-4. Reporting year: 2024. https://usatrade.census.gov/