alpha-Methylstyrene

CAS 98-83-9

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$68M

Top sourceIndia 35%

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 290290 · basket

EPA reports by year

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

These shares come from HS customs code 290290, which covers 171 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).

IN 35%IndiaTW 11%TaiwanES 10%SpainDE 10%GermanyCN 8%China

Czech Republic
Netherlands
Switzerland
Pakistan
United Kingdom
Austria
Denmark
Indonesia
Lithuania
Hong Kong
Finland

EPA-registered manufacturers (4)

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

Shell Plc · GB United Kingdom

Dupont Specialty Products Usa

Shell Petroleum

Soyventis North America

Domestic parents -- activity not disclosed (4)

EPA records name a US company for this chemical but do not disclose whether the company made it here or imported it.

Advansix

Deltech Monomers Bidco Holdings

Sumitomo Corporation Of Americas

Synthomer Jefferson Hills

EPA-registered importers (11)

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

Basf Se · DE Germany

Kh Chemicals International B V · NL Netherlands

Ravago S A · LU Luxembourg

Aoc

Basf

Show all 11

Blue Tree Holdings

Frp Services & Co. (America)

Icc Industries

Ineos Styrolution America

Kh Chemicals Na

Tribute Energy

Why It Matters

Sectors

ConstructionPlastics & RubberConsumer ProductsPaints & CoatingsCore 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 8 sectors as 8 functional roles.

•Heat stabilizer in Petrochemical ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
•Solvent in Asphalt Paving, Roofing, and Coating Materials ManufacturingProcessing—incorporation into article
•Solvent in Plastics Material and Resin Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
•Intermediate in Plastics Material and Resin Manufacturing (25%)Processing as a reactant
•Intermediate in Adhesive Manufacturing (2%)Processing as a reactant
•Intermediate in All Other Chemical Product and Preparation Manufacturing (68%)Processing as a reactant
•Filler in Plastics Material and Resin Manufacturing (5%)Processing as a reactant
•Monomers in Plastics Material and Resin Manufacturing (50%)Processing as a reactant
•Monomers in All Other Basic Organic Chemical Manufacturing (20%)Processing as a reactant
•Monomers in Paint and Coating Manufacturing (30%)Processing as a reactant
•Chain transfer agent in Plastics Product Manufacturing (100%)Processing as a reactant
•Intermediate in All Other Basic Organic Chemical ManufacturingProcessing as a reactant
•Adhesion/cohesion promoter in All Other Basic Organic Chemical ManufacturingProcessing as a reactant
•Monomers in Plastics Product Manufacturing (100%)Processing as a reactant
•Monomers in Petrochemical Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
•Hardener in Paint and Coating ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
•Filler in All Other Chemical Product and Preparation Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product

Vendor Pricing

$0.30/gCombi-Blocks, Inc.

CountryUnited States

Pack$150.00 / 500 g

Purity98%

Vendors4 available

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

3 more vendors

Vendor	Country	$/g	Pack	Purity
Labotest KG	Germany	$217.80	5000 mg	90%
Sigma-Aldrich (Rush Stock)	Germany	$741.08	250 mg	—
Sigma-Aldrich	Germany	$741.08	250 mg	—

Chemical Identity

CAS98-83-9

PubChem CID7407

DTXSIDDTXSID9025661

FormulaC9H10

Mol. Weight118.18 g/mol

SMILESCC(=C)C1=CC=CC=C1

Data Sources

EPA CompTox (DSSTox) · DTXSID9025661Retrieved 2026-04-06
PubChem · compound 7407Retrieved 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

← Back to Dashboard ← Back to Construction

Brief citations

alpha-Methylstyrene (CAS 98-83-9) https://chemicalindependence.com/chemical/98-83-9/ EPA CompTox (DSSTox): DTXSID9025661. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID9025661 PubChem: 7407. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/7407 EPA Chemical Data Reporting: 98-83-9. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 98-83-9. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 290290 for CAS 98-83-9. Reporting year: 2024. https://usatrade.census.gov/