3,3'-Dimethyl-4,4'-diphenylene diisocyanate

CAS 91-97-4

Companies reported imports and no US production of this chemical to EPA for 2019.

US productionZero

Import value, 2024$171M

Import volume14.2K lb

Import dependency100%

Top sourceHungary 35%

Production is reported production, not a complete census of factories. Production reporting year: 2019. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

3,3'-Dimethyl-4,4'-diphenylene diisocyanate · US import value by year

2013: $93M · Peak 2021: $284M · 2024: $171M · 2025: $99M

Where It Comes From

Customs basis: HS 292910 · basket

EPA reports by year

2019: US production Zero · Imports 14.2K lb

These shares come from HS customs code 292910, which covers 57 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).

HU 35%HungaryDE 20%GermanyIT 15%ItalyCN 8%ChinaES 7%Spain

Mexico
India
Switzerland
Panama
United Kingdom
Egypt
Ukraine
Poland
Finland
Malaysia
Slovakia
Austria

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

•Adhesives and sealant chemicals in Rubber Product Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product

Vendor Pricing

$0.15/gAaron Chemicals LLC

CountryHong Kong

Pack$74.00 / 500 g

Purity98%

Vendors9 available

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

8 more vendors

Vendor	Country	$/g	Pack	Purity
Angene Chemical	China → Hong Kong	$0.16	500 g	98%
A2B Chem LLC	United States	$0.47	100 g	98%
AA BLOCKS	United States	$0.58	100 g	98%
AstaTech (2 weeks)	United States	$2.14	250 g	95%
AK Scientific Specialized	United States	$3.71	100 g	95%
AK Scientific, Inc.	United States	$5.02	100 g	98%
Angene International Limited	United States	$8.06	100 g	98%
Angene	China → Hong Kong	$4266.67	30 mg	98%

Chemical Identity

CAS91-97-4

PubChem CID7072

DTXSIDDTXSID7041463

FormulaC16H12N2O2

Mol. Weight264.28 g/mol

SMILESCC1=C(C=CC(=C1)C2=CC(=C(C=C2)N=C=O)C)N=C=O

Data Sources

EPA CompTox (DSSTox) · DTXSID7041463Retrieved 2026-04-06
PubChem · compound 7072Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2019 · Retrieved 2026-10-04
EPA Chemical Data ReportingReporting year: 2019 · Retrieved 2026-10-04
US Census international tradeReporting year: 2024 · Retrieved 2026-10-04

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Brief citations

3,3'-Dimethyl-4,4'-diphenylene diisocyanate (CAS 91-97-4) https://chemicalindependence.com/chemical/91-97-4/ EPA CompTox (DSSTox): DTXSID7041463. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID7041463 PubChem: 7072. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/7072 EPA Chemical Data Reporting: 91-97-4. Reporting year: 2019. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 91-97-4. Reporting year: 2019. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 292910 for CAS 91-97-4. Reporting year: 2024. https://usatrade.census.gov/