CAS 12136-45-7PubChem CID 9989219
Potassium oxide
Potassium oxide is a metal oxide with formula K2O. It is a metal oxide and a potassium salt. — ChEBI
- IUPAC name
- dipotassium;oxygen(2-)
- Molecular formula
- K2O
- Molecular weight
- 94.196 g/mol
- Exact mass
- 93.92232759 Da
- Topological polar surface area
- 1.0 Ų
- Hydrogen-bond donors
- 0
- Hydrogen-bond acceptors
- 1
- Covalent units
- 3
- Defined stereocentres
- 0
Also known as
Dipotassium oxideDipotassium monoxidePotassium monoxideCHEBI:8832158D606078HRefChem:175554235-227-6Potassium oxide (K2O)
3 more reported names
potassium oxidopotassiumCHWRSCGUEQEHOH-UHFFFAOYSA-NDB-255985
External database identifiers
- ChEBI:CHEBI:88321
- EPA DTXSID:DTXSID3049754
Evidence from additional scientific databases
NIH PubChem PUG-View
Exact identifier match9989219
Attributed physical-property, hazard, environmental and use annotations.
- Density: 2.3 g/cm³ Source: ILO-WHO International Chemical Safety Cards (ICSCs)
- Physical Description: Potassium monoxide appears as a white-colored crystalline solid. Denser than water. Contact may severely irritate skin, eyes and mucous membranes. May be toxic by ingestion, inhalation and skin absorption. Used to make other chemicals. Source: CAMEO Chemicals
- Physical Description: Dry Powder; Other Solid; Liquid; Dry Powder; Large Crystals; CBI; Large Crystals; Other Solid; Dry Powder Source: EPA Chemical Data Reporting (CDR)
- Physical Description: Grey hygroscopic solid; [ICSC] White solid; [CAMEO] Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
- Physical Description: GREY HYGROSCOPIC CRYSTALLINE POWDER. Source: ILO-WHO International Chemical Safety Cards (ICSCs)
- Solubility: Solubility in water: reaction Source: ILO-WHO International Chemical Safety Cards (ICSCs)
- Exposure Routes: Serious local effects by all routes of exposure. Source: ILO-WHO International Chemical Safety Cards (ICSCs)
- First Aid: Excerpt from ERG Guide 154 [Substances - Toxic and/or Corrosive (Non-Combustible)]:; Refer to the "General First Aid" section. Specific First Aid: For corrosives, in case of contact, immediately flush skin or eyes with running water for at least 30 minutes. Additional flushing may be required. (ERG, 2024) Source: CAMEO Chemicals
- ERG2024, Guide 154 (Potassium monoxide): General First Aid:; · Call 911 or emergency medical service.; · Ensure that medical personnel are aware of the material(s) involved, take precautions to protect themselves and avoid contamination.; · Move victim to fresh air if it can be done safely.; · Administer oxygen if breathing is difficult.; · If victim is not breathing:; -- DO NOT perform mouth-to-mouth resuscitation; the victim may have ingested or inhaled the substance.; -- If equipped and pulse detected, wash face and mouth, then give artificial respiration using a proper respiratory medical device (bag-valve mask, pocket mask equipped with a one-way valve or other device).; -- If no pulse detected or no respiratory medical device available, provide continuous compressions. Conduct a pulse check every two minutes or monitor for any signs of spontaneous respirations.; · Remove and isolate contaminated clothing and shoes.; · For minor skin contact, avoid spreading material on unaffected skin.; · In case of contact with substance, remove immediately by flushing skin or eyes with running water for at least 20 minutes.; · For severe burns, immediate medical attention is required.; · Effects of exposure (inhalation, ingestion, Source: Emergency Response Guidebook (ERG)
- Note: This chemical does not meet GHS hazard criteria for 21% (119 of 566) of reports. Source: European Chemicals Agency (ECHA)
- Signal: Danger Source: European Chemicals Agency (ECHA)
- GHS Hazard Statements: H314 (78.3%): Causes severe skin burns and eye damage [Danger Skin corrosion/irritation]; H318 (52.3%): Causes serious eye damage [Danger Serious eye damage/eye irritation] Source: European Chemicals Agency (ECHA)
- Precautionary Statement Codes: P260, P264, P264+P265, P280, P301+P330+P331, P302+P361+P354, P304+P340, P305+P354+P338, P316, P317, P321, P363, P405, and P501 (click each P-code to see the statement) Source: European Chemicals Agency (ECHA)
- ECHA C&L Notifications Summary: Aggregated GHS information provided per 566 reports by companies from 17 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.; Reported as not meeting GHS hazard criteria per 119 of 566 reports by companies.; There are 16 notifications provided by 447 of 566 reports by companies with hazard statement code(s).; Information may vary between notifications depending on impurities, additives, and other factors. The percentage value in parenthesis indicates the notified classification ratio from companies that provide hazard codes. Only hazard codes with percentage values above 10% are shown. For more detailed information, please visit ECHA C&L website. Source: European Chemicals Agency (ECHA)
- Consumer Uses: Other; Intermediate; Dehydrating agent (desiccant) Source: EPA Chemical Data Reporting (CDR)
- Industry Uses: Other; Not Known or Reasonably Ascertainable; Catalyst; Absorbent; Dehydrating agent (desiccant); Adsorbent; Intermediate Source: EPA Chemical Data Reporting (CDR)
- Sources/Uses: Used to make other chemicals; [CAMEO] Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
Mapped by: Existing checksum-valid CAS to unique PubChem CID match. Retrieved: 2026-08-31. Open source record
Scientific classifications and hazard annotations provide context and do not replace the market-specific regulatory decision shown above.
Additional source coverage and match status
| Source | Result | Checked |
|---|---|---|
| NIH PubChem PUG-View | Exact match | 2026-08-31 |
A recorded no-match is useful evidence that the source was checked; it is not a claim that the substance does not exist elsewhere.
Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.