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Silicon carbide

CAS 409-21-2

U.S. production volumes are classified as confidential business information.

Molecular structure of 409-21-2
US productionCBI
Import value, 2024$196M
Top sourceChina 44%

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.

Where It Comes From

Customs basis: HS 284920 · exact

EPA reports by year
2023
US production Confidential · Imports Confidential
2019
US production Confidential · Imports Confidential
Source Countries
CN 44%ChinaNO 33%NorwayTW 8%TaiwanBR 5%BrazilJP 4%Japan
EPA-registered manufacturers (2)
Minerals Technologies
Rio Tinto America Holdings
Domestic parents -- activity not disclosed (3)
Coorstek
Fujimi
Wolfspeed
EPA-registered importers (10)
Agc · JP Japan
Heidelberg Materials Ag · DE Germany
Kyocera · JP Japan
Agc America
Heidelberg Materials Us Cement
Show all 10
Imerys
Kyocera International
Pyrotek
Radiac Abrasives
Saint Gobain

Why It Matters

Sectors
ElectronicsTransportationConstructionMetals & MiningCore Chemicals
Downstream UsesNot recorded
FDA Shortage Status
No FDA shortage records

Industrial Uses

Used in 7 sectors as 4 functional roles.

  • •Abrasives in All Other Basic Inorganic Chemical Manufacturing (100%)Processing—incorporation into article
  • •Abrasives in Miscellaneous ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
  • •Abrasives in Transportation Equipment ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
  • •Abrasives in ConstructionProcessing—incorporation into formulation, mixture, or reaction product
  • •Hardener in Primary Metal ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
  • •Abrasives in Computer and Electronic Product ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
  • •Abrasives in Primary Metal ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
  • •Stabilizing agent in Primary Metal Manufacturing (100%)Processing—incorporation into article
  • •Alloys in Fabricated Metal Product Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product

Chemical Identity

CAS409-21-2
PubChem CID9863
DTXSIDDTXSID5052751
FormulaCSi
Mol. Weight40.096 g/mol
SMILES[C-]#[Si+]

Data Sources

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Brief citations

Silicon carbide (CAS 409-21-2) https://chemicalindependence.com/chemical/409-21-2/ EPA CompTox (DSSTox): DTXSID5052751. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID5052751 PubChem: 9863. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/9863 EPA Chemical Data Reporting: 409-21-2. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 409-21-2. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 284920 for CAS 409-21-2. Reporting year: 2024. https://usatrade.census.gov/