Silicon
CAS 7440-21-3
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$102M
Top sourceGermany 51%
At least one company claimed its 2023 production or import volume for this chemical as confidential, so EPA withholds it.
Why supply is unknownProduction 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 280461 · exact
EPA reports by year
- 2023
- US production Confidential · Imports Confidential
- 2019
- US production Confidential · Imports Confidential
Source Countries
Country of origin for US imports, from Census customs data (2024).
DE 51%GermanyTW 24%TaiwanJP 8%JapanCN 7%ChinaKR 4%South Korea
- Vietnam
- Norway
- Ukraine
- Singapore
- Canada
- Spain
- Netherlands
EPA-registered manufacturers (21)
Companies that report making or importing this chemical to the EPA. Registration is US-centric and does not indicate import origin.
Ferroglobe Plc · GB United Kingdom
Hindalco Industries · IN India
Arconic Us
Cannon Muskegon
Constellium
Show all 21
Corning
Ferroglobe Usa
High-Purity Silicon America
Luvata Fabrication North America
Minerals Technologies
Mississippi Silicon
North American Hoganas
North American Hoganas High Al
Novelis
Real Alloy Holding
Real Alloy Recycling
Rec Silicon
Rio Tinto America Holdings
Shinagawa Americas
Tennessee Aluminum Processors
Vibrantz Technologies
Domestic parents -- activity not disclosed (10)
EPA records name a US company for this chemical but do not disclose whether the company made it here or imported it.
3M
Alcoa
Elg Metals
J.W. Harris
Jupiter Aluminum
Show all 10
Mom Holding
Toyota Tsusho America
Trafigura Trading
Wacker Polysilicon North America
Wolfspeed
EPA-registered importers (42)
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
Glencore Plc · CH Switzerland
Green Metals Canada · CA Canada
Hindalco Industries · IN India
Jfe Steel · JP Japan
Show all 42
Jsw Steel · IN India
Marubeni · JP Japan
Toyota Tsusho · JP Japan
Uacj · JP Japan
Acero Junction Holdings
Advanced Micronutrient Products
Alter Trading
American Metal Fibers
Basf
Basstech International
Century Aluminum
Chemalloy
Cleveland Cliffs Burns Harbor
Cleveland Cliffs Steel
Cleveland-Cliffs
Cronimet Specialty Metals Usa
Dow Chemical
Ei Ceramics
Glencore
Hma
Honda Trading America
Kaiser Aluminum
Mahle Behr Usa
Marubeni America
Metal One America
Mitsubishi Corporation (Americas)
Nucor
Omnisource
Pnw Metal Recycling
Radius Recycling
St Marys Cement
Steel Dynamics
Sterling Steel
Tesla
The Lincoln Electric
Tms International
Tri-Arrows Aluminum
Why It Matters
Sectors
AgricultureEnergyWaterElectronicsTransportationConstructionMetals & MiningConsumer ProductsPaints & CoatingsPaper & PrintingCore 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 18 sectors as 13 functional roles.
- •Intermediate in All Other Basic Organic Chemical Manufacturing (100%)Processing as a reactant
- •Intermediate in Primary Metal Manufacturing (100%)Processing—incorporation into article
- •Intermediate in All Other Basic Inorganic Chemical Manufacturing (100%)Processing as a reactant
- •Intermediate in All Other Chemical Product and Preparation Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
- •Intermediate in Paint and Coating Manufacturing (100%)Processing as a reactant
- •Alloys in Machinery ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
- •Alloys in Wholesale and Retail Trade (100%)Processing—repackaging
- •Semiconductor and photovoltaic agent in Computer and Electronic Product ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
- •Binder in All Other Basic Inorganic Chemical Manufacturing (0%)Processing—incorporation into formulation, mixture, or reaction product
- •Alloys in Primary Metal Manufacturing (100%)Use—non-incorporative activities
- •Alloys in Fabricated Metal Product Manufacturing (100%)Processing—incorporation into article
- •Alloys in Miscellaneous Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
- •Soil amendments (fertilizers) in Pesticide, Fertilizer, and Other Agricultural Chemical Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
- •Filler in Machinery ManufacturingUse—non-incorporative activities
- •Hardener in Miscellaneous ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
- •Hardener in Primary Metal ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
- •Alloys in OtherProcessing—incorporation into article
- •Alloys in Transportation Equipment Manufacturing (5%)Processing—incorporation into article
- •Stabilizing agent in Primary Metal Manufacturing (100%)Processing—incorporation into article
- •Alloys in Non-metallic Mineral Product Manufacturing (includes clay, glass, cement, concrete, lime, gypsum, and other non-metallic mineral product manufacturing) (0%)Processing—incorporation into article
- •Fuel agents in Petroleum Refineries (100%)Processing—incorporation into formulation, mixture, or reaction product
- •Heat stabilizer in Primary Metal Manufacturing (100%)Processing—incorporation into article
- •Alloys in Construction (21%)Processing—incorporation into article
- •Anti-adhesive/cohesive in Printing Ink ManufacturingProcessing—repackaging
- •Flocculating agent in Utilities (10%)Processing—incorporation into formulation, mixture, or reaction product
- •Flame retardant in All Other Basic Inorganic Chemical Manufacturing (2%)Processing—incorporation into formulation, mixture, or reaction product
Chemical Identity
CAS7440-21-3
PubChem CID5461123
DTXSIDDTXSID0051441
FormulaSi
Mol. Weight28.085 g/mol
SMILES[Si]
Data Sources
- EPA CompTox (DSSTox) · DTXSID0051441Retrieved 2026-04-06
- PubChem · compound 5461123Retrieved 2026-04-06
- EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
- FDA National Drug Code directoryRetrieved 2026-04-07
- US Census international tradeReporting year: 2024 · Retrieved 2026-10-04
Brief citations
Silicon (CAS 7440-21-3) https://chemicalindependence.com/chemical/7440-21-3/ EPA CompTox (DSSTox): DTXSID0051441. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID0051441 PubChem: 5461123. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/5461123 EPA Chemical Data Reporting: 7440-21-3. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting FDA National Drug Code directory: CAS 7440-21-3. Retrieved 2026-04-07. https://open.fda.gov/data/ndc/ US Census international trade: HS 280461 for CAS 7440-21-3. Reporting year: 2024. https://usatrade.census.gov/