Calcium oxide
CAS 1305-78-8
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$49M
Top sourceCanada 68%
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 252210 · 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).
CA 68%CanadaMX 29%MexicoGB 2%United KingdomES 1%Spain
- India
- Austria
- Italy
- Japan
- Malaysia
- China
- South Korea
- Oman
EPA-registered manufacturers (32)
Companies that report making or importing this chemical to the EPA. Registration is US-centric and does not indicate import origin.
Amg Critical Materials Nv · NL Netherlands
Basf Se · DE Germany
Carmeuse Holding Sa · LU Luxembourg
Clariant International · CH Switzerland
Karta Halten B V · NL Netherlands
Show all 32
Agmet
Austin White Lime
Basf
Carmeuse Lime
Cheney Lime And Cement
Clariant
Domtar
Evergreen Packaging
Graymont
Heraeus Metal Processing
International Paper
Kennametal
Mcwane
Mcwane Ductile New Jersey
Metallurg
Minerals Technologies
Minn Dak Farmers Cooperative
Mississippi Lime
Nd Otm
Nd Paper
O'Brien Industrial Holdings
Sappi Cloquet
Sdw Holdings
Southern Minnesota Beet Sugar Cooperative
Steel Dust Recycling
Sunflower Electric Power
Westrock
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.
Advanced Micronutrient Products
Capital Recovery Group
Greer Lime
Honeywell International (123312)
Lhoist North America
Show all 10
Mira Dissolution Authority
Packaging Corporation Of America
Pete Lien & Sons
Pixelle Specialty Solutions
Rpm International
EPA-registered importers (29)
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
Clariant International · CH Switzerland
Grupo Mxico S A B De C V · MX Mexico
Jsw Steel · IN India
Mercedes-Benz Group Ag · DE Germany
Show all 29
Safic-Alcan · FR France
Sika Ag · CH Switzerland
Teck Resources · CA Canada
3M
Acero Junction Holdings
Air Products And Chemicals
Americas Mining
Aoc
Arkema
Blachford
Chemspec
Denka
Imerys
International Grand Investment Corporation (Igic)
Mercedes-Benz Vans
Nishikawa Cooper
Nucor Steel Louisiana
Reading Alloys
Ricoh Electronics
Sika
St Marys Cement
Sylvamo North America
Teck American Incorporated
W. R. Grace & Co. - Conn.
Why It Matters
Sectors
AgricultureFoodEnergyWaterTransportationConstructionMetals & MiningPlastics & RubberTextilesConsumer 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 28 sectors as 26 functional roles.
- •Absorbent in Utilities (13%)Processing as a reactant
- •Adhesion/cohesion promoter in Construction (37%)Processing as a reactant
- •Absorbent in Wholesale and Retail Trade (42%)Processing as a reactant
- •Absorbent in Primary Metal Manufacturing (7%)Processing as a reactant
- •Absorbent in Food, beverage, and tobacco product manufacturing (1%)Processing as a reactant
- •Absorbent in Paper Manufacturing (66%)Processing as a reactant
- •Abrasives in Paper Manufacturing (100%)Processing as a reactant
- •Intermediate in Non-metallic Mineral Product Manufacturing (includes clay, glass, cement, concrete, lime, gypsum, and other non-metallic mineral product manufacturing) (8%)Processing as a reactant
- •Intermediate in Paper Manufacturing (100%)Processing as a reactant
- •Corrosion inhibitor in Construction (1%)Processing as a reactant
- •Absorbent in Construction (10%)Processing as a reactant
- •pH regulating agent in Utilities (1%)Processing as a reactant
- •Flux agent in Primary Metal Manufacturing (11%)Processing as a reactant
- •Adsorbent in All Other Basic Inorganic Chemical ManufacturingUse—non-incorporative activities
- •Adsorbent in Industrial Gas ManufacturingUse—non-incorporative activities
- •Adsorbent in Petrochemical ManufacturingUse—non-incorporative activities
- •Intermediate in Primary Metal ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
- •pH regulating agent in Synthetic Dye and Pigment ManufacturingProcessing as a reactant
- •pH regulating agent in Primary Metal ManufacturingProcessing as a reactant
- •Filler in Paper ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
- •Intermediate in Plastics Product ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
- •Intermediate in Food, beverage, and tobacco product manufacturingProcessing as a reactant
- •Adhesion/cohesion promoter in Asphalt Paving, Roofing, and Coating Materials ManufacturingProcessing as a reactant
- •pH regulating agent in Paper ManufacturingProcessing as a reactant
- •Oxidizing agent in Primary Metal Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
- •Adsorbent in UtilitiesProcessing as a reactant
- •Adsorbent in Primary Metal ManufacturingProcessing as a reactant
- •pH regulating agent in Wholesale and Retail TradeProcessing as a reactant
- •pH regulating agent in Plastics Material and Resin ManufacturingProcessing as a reactant
- •pH regulating agent in Mining (except Oil and Gas) and support activitiesProcessing as a reactant
- •pH regulating agent in Non-metallic Mineral Product Manufacturing (includes clay, glass, cement, concrete, lime, gypsum, and other non-metallic mineral product manufacturing)Processing as a reactant
- •Adsorbent in Paper Manufacturing (13%)Processing as a reactant
- •pH regulating agent in Food, beverage, and tobacco product manufacturingProcessing as a reactant
- •Soil amendments (fertilizers) in Wholesale and Retail TradeProcessing as a reactant
- •Filler in Plastics Material and Resin ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
- •pH regulating agent in All Other Chemical Product and Preparation ManufacturingProcessing as a reactant
- •Filler in Transportation Equipment Manufacturing (100%)Processing—incorporation into article
- •Soil amendments (fertilizers) in Agriculture, Forestry, Fishing and HuntingUse—non-incorporative activities
- •Dehydrating agent (desiccant) in Rubber Product ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
- •Dehydrating agent (desiccant) in Synthetic Rubber ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
- •Dehydrating agent (desiccant) in Paint and Coating Manufacturing (27%)Processing—incorporation into formulation, mixture, or reaction product
- •Dehydrating agent (desiccant) in Construction (1%)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
- •Catalyst in Pesticide, Fertilizer, and Other Agricultural Chemical Manufacturing (100%)Use—non-incorporative activities
- •Antioxidant in UtilitiesProcessing as a reactant
- •Antioxidant in Paper ManufacturingProcessing as a reactant
- •Catalyst in Petrochemical Manufacturing (99%)Use—non-incorporative activities
- •Catalyst in All Other Chemical Product and Preparation Manufacturing (1%)Use—non-incorporative activities
- •Intermediate in All Other Basic Inorganic Chemical Manufacturing (0%)Processing as a reactant
- •Solids separation (precipitating) agent, not otherwise specified in Primary Metal ManufacturingProcessing as a reactant
- •Stabilizing agent in ConstructionProcessing as a reactant
- •pH regulating agent in OtherProcessing as a reactant
- •Solids separation (precipitating) agent, not otherwise specified in Paper ManufacturingProcessing as a reactant
- •Filler in Asphalt Paving, Roofing, and Coating Materials ManufacturingProcessing as a reactant
- •Solids separation (precipitating) agent, not otherwise specified in UtilitiesProcessing as a reactant
- •Intermediate in Carbon Black ManufacturingProcessing as a reactant
- •Filler in ConstructionProcessing as a reactant
- •Abrasives in Miscellaneous Manufacturing (0%)Use—non-incorporative activities
- •Binder in Miscellaneous Manufacturing (80%)Processing—incorporation into article
- •pH regulating agent in Miscellaneous Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
- •Stabilizing agent in Primary Metal Manufacturing (100%)Processing—incorporation into article
- •Thickening agent in Plastics Product Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
- •Chemical reaction regulator in Primary Metal Manufacturing (100%)Processing—incorporation into article
- •Binder in Primary Metal Manufacturing (100%)Processing—incorporation into article
- •Dehydrating agent (desiccant) in Petroleum RefineriesUse—non-incorporative activities
- •Dehydrating agent (desiccant) in Petrochemical ManufacturingUse—non-incorporative activities
- •Dehydrating agent (desiccant) in Industrial Gas ManufacturingUse—non-incorporative activities
- •Dehydrating agent (desiccant) in Non-metallic Mineral Product Manufacturing (includes clay, glass, cement, concrete, lime, gypsum, and other non-metallic mineral product manufacturing)Processing—incorporation into formulation, mixture, or reaction product
- •Dust suppressant in ServicesProcessing as a reactant
- •Processing aids, specific to petroleum production in ConstructionProcessing as a reactant
- •pH regulating agent in ConstructionProcessing as a reactant
- •Chelating agent in Primary Metal ManufacturingProcessing as a reactant
- •Dehydrating agent (desiccant) in Printing and Related Support Activities (100%)Processing—repackaging
- •Absorbent in Plastics Material and Resin Manufacturing (10%)Processing—incorporation into formulation, mixture, or reaction product
- •Catalyst in Petroleum RefineriesUse—non-incorporative activities
- •Absorbent in Industrial Gas ManufacturingUse—non-incorporative activities
- •Absorbent in Paint and Coating Manufacturing (20%)Use—non-incorporative activities
- •Catalyst in Plastics Material and Resin ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
- •Catalyst in All Other Basic Inorganic Chemical ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
- •Dehydrating agent (desiccant) in All Other Chemical Product and Preparation ManufacturingProcessing as a reactant
- •Waterproofing agent in ConstructionProcessing as a reactant
- •Absorbent in All Other Chemical Product and Preparation ManufacturingProcessing as a reactant
- •Drier in Mining (except Oil and Gas) and support activitiesProcessing as a reactant
- •Sealant (barrier) in ConstructionProcessing as a reactant
- •Dehydrating agent (desiccant) in Agriculture, Forestry, Fishing and HuntingProcessing as a reactant
- •Humectant in Primary Metal ManufacturingProcessing as a reactant
- •Chelating agent in Paper ManufacturingProcessing as a reactant
- •Absorbent in Mining (except Oil and Gas) and support activitiesProcessing as a reactant
- •Adsorbent in Mining (except Oil and Gas) and support activitiesProcessing as a reactant
- •Adhesion/cohesion promoter in Non-metallic Mineral Product Manufacturing (includes clay, glass, cement, concrete, lime, gypsum, and other non-metallic mineral product manufacturing)Processing as a reactant
- •Absorbent in Non-metallic Mineral Product Manufacturing (includes clay, glass, cement, concrete, lime, gypsum, and other non-metallic mineral product manufacturing)Processing as a reactant
- •Absorbent in Services (100%)Processing as a reactant
- •Catalyst in Services (57%)Use—non-incorporative activities
- •Intermediate in Services (11%)Processing as a reactant
Vendor Pricing
$0.12/gSigma-Aldrich (Rush Stock)
CountryGermany
Pack$303.04 / 2.5 kg
PurityNot recorded
Vendors4 available
Prices reflect listed pack sizes. Small research packs run far above bulk rates.
3 more vendors
| Vendor | Country Supplier country. Where available, shows shipping origin. When the supplier ships from a different country than where they are registered, both are shown. Most suppliers show registration country only. | $/g | Pack | Purity |
|---|---|---|---|---|
| Sigma-Aldrich | Germany | $0.12 | 2.5 kg | — |
| Combi-Blocks, Inc. | United States | $0.25 | 1 kg | 97% |
| AK Scientific, Inc. | United States | $0.48 | 100 g | — |
Chemical Identity
CAS1305-78-8
PubChem CID14778
DTXSIDDTXSID5029631
FormulaCaO
Mol. Weight56.08 g/mol
SMILESO=[Ca]
Data Sources
- EPA CompTox (DSSTox) · DTXSID5029631Retrieved 2026-04-06
- PubChem · compound 14778Retrieved 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
Brief citations
Calcium oxide (CAS 1305-78-8) https://chemicalindependence.com/chemical/1305-78-8/ EPA CompTox (DSSTox): DTXSID5029631. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID5029631 PubChem: 14778. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/14778 EPA Chemical Data Reporting: 1305-78-8. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 1305-78-8. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 252210 for CAS 1305-78-8. Reporting year: 2024. https://usatrade.census.gov/