CompoundList
Sign in
Oxides and peroxides

Potassium oxide

Also known as Dipotassium oxide, Dipotassium monoxide, Potassium monoxide

CAS 12136-45-7Formula K2OMolar mass 94.20 g/molEC 235-227-6
GHS signal word: Danger. Pictograms: Corrosive 31 suppliers listed
Get quotes Compare 31 suppliers
Potassium oxide chemical structure, K2O, CAS 12136-45-7
2D chemical structure

Key facts

What buyers check first

All properties
Physical form
Crystals
Density
2.3 g/cm³
Solubility
Solubility in water: reaction
HS code
281530
Category
Oxides and peroxides
UN number
UN 2033
Illustrative photo, closed blue fibre drums on a pallet in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Potassium oxide?

Plain description, key identifiers and synonyms

Potassium oxide is a metal oxide with formula K2O. It is a metal oxide and a potassium salt.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
dipotassium, oxygen(2-)
CAS number
12136-45-7 CAS number cross-checked
EC number
235-227-6
Molecular formula
K2O
UNII
58D606078H
INCI name
POTASSIUM OXIDE
InChIKey
CHWRSCGUEQEHOH-UHFFFAOYSA-N
InChI
InChI=1S/2K.O/q2*+1;-2
SMILES (canonical and isomeric)
[O-2].[K+].[K+]

Synonyms

  • Dipotassium oxide
  • Dipotassium monoxide
  • Potassium monoxide
  • Potassium oxide (K2O)
  • potassium oxidopotassium

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Physical form
Crystalsexp.
Density
2.3 g/cm³exp.
Solubility
Solubility in water: reactionexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
94.20 g/molcalc.
Exact mass
93.9223 Dacalc.
LogP (octanol/water)
-6.11calc.
Topological polar surface area
28.5 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
0calc.
Heavy atoms
3calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
3calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS05: Corrosive
Corrosive

Hazard statements

  • H314Causes severe skin burns and eye damage.
  • H318Causes serious eye damage.
Precautionary statements (14)
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P330 + P331If swallowed: Rinse mouth. Do not induce vomiting.
  • P302 + P361 + P354If on skin: Take off immediately all contaminated clothing. Immediately rinse with water for several minutes.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P354 + P338If in eyes: Immediately rinse with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P316Get emergency medical help immediately.
  • P317Get medical help.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P363Wash contaminated clothing before reuse.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 2033
Transport hazard class
8
Packing group
II

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Potassium oxide suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 31 suppliers
30 of 30 offers

Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

31 suppliers in 9 countries

Send one request to many suppliers

Choose up to 10 suppliers or let us match your request. Compare quotes side by side, free.

Choose suppliersPost a request

Potassium oxide price

Indicative price range per kg from live supplier offers

No published prices right now

Suppliers quote this chemical on request. Send one free request and compare quotes side by side.

Get latest price

Uses and applications

What the substance is used for, by industry and function

Industrial uses: Other, Catalyst, Absorbent, Dehydrating agent (desiccant), Adsorbent, Intermediate.

Consumer uses: Other, Intermediate, Dehydrating agent (desiccant).

Cosmetic ingredient, INCI name POTASSIUM OXIDE(buffering)

Functional uses

  • Binder
  • Catalyst
  • Flux agent
  • pH regulating agent

Cosmetic functions

  • Buffering

Regulatory status

Inventories, regulations and trade controls that list this substance

Health and food

  • EU cosmetic ingredient inventory

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Potassium oxide is traded under.

HS 2815.30Indicative HS code

Peroxides of sodium or potassium

World exports in 2024
$12.5M
−7.3% vs 2023, imports $12.9M
2019 to 2024
Top exporters
  1. China31.6%
  2. France * partner reported23.9%
  3. United States12.7%
Top importers
  1. United States22.5%
  2. Germany10.0%
  3. South Africa9.9%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Potassium oxide is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Potassium oxide, based on the data on this page

What is Potassium oxide?

Potassium oxide is a metal oxide with formula K2O. It is a metal oxide and a potassium salt.

What is the CAS number of Potassium oxide?

The CAS registry number of Potassium oxide is 12136-45-7.

What is the molecular formula and weight of Potassium oxide?

The molecular formula of Potassium oxide is K2O and its molar mass is 94.20 g/mol.

What is Potassium oxide used for?

Industrial uses: Other, Catalyst, Absorbent, Dehydrating agent (desiccant), Adsorbent, Intermediate. Consumer uses: Other, Intermediate, Dehydrating agent (desiccant).

Is Potassium oxide hazardous?

Potassium oxide carries the GHS signal word "Danger". Main hazards: causes severe skin burns and eye damage, causes serious eye damage. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Potassium oxide?

Potassium oxide is usually classified under HS code 281530 (Peroxides of sodium or potassium). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Potassium oxide?

CompoundList lists 31 suppliers of Potassium oxide in India, United States, China, New Zealand and 5 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Potassium oxide in India?

11 suppliers in India list Potassium oxide on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Potassium oxide?

Suppliers quote Potassium oxide on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Potassium oxide

Get quotes for Potassium oxide

Post one free request with your grade, quantity and destination. Matching suppliers send quotes you can compare side by side.
Post a request Sell Potassium oxide
Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
Embed this structure on your websiteShow code

Paste this code into your page to show the 2D structure of Potassium oxide with a 3D view, its CAS number where known and a link back to this page. Free to use with the link kept.

<iframe src="https://www.compoundlist.com/embed/structure/potassium-oxide-12136-45-7" title="Potassium oxide structure on CompoundList" width="360" height="420" style="border:1px solid #E7E2DA;border-radius:12px;max-width:100%" loading="lazy" referrerpolicy="strict-origin-when-cross-origin"></iframe>
Preview the embed

Explore more in Oxides and peroxides or HS code 281530

31 suppliers
Free quotes, contact stays private
Get quotes