Mineral Fillers & Pigments Available — Bulk Only

Potassium Hydroxide (KOH, Caustic Potash)

KOH
CAS 1310-58-3 · Formula HKO · MW 56.106 g/mol

A high-purity caustic alkali for saponification, alkaline electrolytes, and metal- and wafer-cleaning baths. It is used to manufacture liquid and soft soaps, as an electrolyte in alkaline batteries, and as an etchant and cleaning alkali in electroplating and semiconductor processing.

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UN Number
UN 1813
Hazard Class
Class 8
HS Code
2815.20
At a Glance
Material Family
Mineral Fillers & Pigments
Record Type
Pure compound
Primary Role
pH Adjustment · Cleaning / Degreasing
Solubility
107 g/100 cc at 15 °C
Functional Roles
POTASSIUM HYDROXIDE
BUFFERING
Applications & Use Cases
  • Soap & surfactant manufacture: Saponification base for liquid and potassium soaps
  • Battery production: Alkaline electrolyte
  • Metal finishing: Alkali for electroplating and acid/alkali metal cleaning
  • Semiconductor manufacturing: Wet etchant for silicon
  • Cleaning formulations: Active alkali in industrial cleaners and drain openers
Physical Properties
Melting Point
360 °C approximately
Boiling Point
> 130 °C at 760 mmHg
Density
1.45 to 1.50 at 20 °C
Solubility
107 g/100 cc at 15 °C
Vapor Pressure
1 mmHg at 719 °C; 5 mmHg at 814 °C
pH
Strongly alkaline (1 % solution)
Safety & Handling
Full SDS available on request

A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.

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DOT / UN Transport Classification
DOT hazard class 8 placard
UN / DOT NumberUN 1813
Hazard Class / DivisionClass 8
Packing GroupII
Proper Shipping NamePotassium hydroxide, solid

Transport classification per the UN Model Regulations / 49 CFR 172.101 Hazardous Materials Table. Confirm against the grade-specific SDS (Section 14) before shipping.

HS / Tariff Classification
Harmonized System (HS) Code — 6-digit international heading
2815 . 20
Chapter 28
Inorganic chemicals; compounds of precious metals and rare-earth metals
Heading 28.15
Internationally harmonized (WCO HS)
Subheading 2815.20
6-digit international code — national tariff line adds further digits
Chemical Identity
CAS Number
1310-58-3
Molecular Formula
HKO
Molecular Weight
56.106 g/mol
IUPAC Name
potassium hydroxide
INCI Name
POTASSIUM HYDROXIDE
PubChem CID
InChI Key
KWYUFKZDYYNOTN-UHFFFAOYSA-M
Synonyms & Trade Names
POTASSIUM HYDROXIDE Caustic potash Potash lye Potassium hydrate Potassium hydroxide (K(OH)) Hydroxyde de potassium Potassa Potasse caustique Caustic-potash Kali causticum Cyantek CC 723 Kaliumhydroxid Potassio (idrossido di) Potassium (hydroxyde de) INS NO.525
Full Description

Potassium hydroxide (CAS 1310-58-3), also called caustic potash, is a strong inorganic base supplied as flake, pellet, or aqueous solution. It is used to manufacture liquid and soft soaps, as an electrolyte in alkaline batteries, and as an etchant and cleaning alkali in electroplating and semiconductor processing.

Frequently Asked Questions

What is the common name for potassium hydroxide?

Potassium hydroxide (CAS 1310-58-3) is commonly called caustic potash. It is a strong inorganic base supplied as flake, pellet, or aqueous solution.

What is potassium hydroxide used for?

It is used to manufacture liquid and soft (potassium) soaps via saponification, as the alkaline electrolyte in batteries, as an etchant and cleaning alkali in electroplating and semiconductor processing, and as the active alkali in industrial cleaners. It is supplied in flake, pellet, or solution form.

Is potassium hydroxide used to make soap?

Yes. Potassium hydroxide is the saponification base for liquid and soft soaps; sodium hydroxide is used for hard bar soaps. The potassium soaps it produces are more soluble, which suits liquid formulations.

How does potassium hydroxide solution ship under DOT regulations?

Potassium hydroxide solution is assigned UN 1814 and is regulated as a corrosive for transport. We ship with the required hazard documentation, SDS, and CoA. Refer to the SDS for handling, storage, and GHS classification before use.

What grades and packaging are available in bulk?

We supply potassium hydroxide as flake, pellet, or aqueous solution in industrial packaging including drums, IBCs, and totes, with a CoA per lot. It classifies under HS 2815.20. Request a quote with your grade, concentration, and volume.

Disclaimer. Information on this page — including properties, identifiers, hazard, transport (DOT/UN) and tariff (HS) classifications, and applications — is provided for general reference and is compiled from authoritative public sources (e.g. PubChem/ECHA, 49 CFR 172.101, the Harmonized Tariff Schedule). Values are typical and are not a guaranteed specification; the Certificate of Analysis (CoA) for the lot purchased governs. Products are sold for industrial and professional use only. Nothing here is a medical, health, or efficacy claim or advice. Always consult the current Safety Data Sheet (SDS) before handling, storage, transport or disposal, and confirm regulatory status, classification and suitability for your application and jurisdiction. Hazard, transport and tariff classifications must be verified for your specific shipment. RawSource makes no warranty, express or implied, and assumes no liability for use of this information. Trademarks. Third-party trademarks and brand names are the property of their respective owners; any reference is nominative — used only to identify a comparable product — and does not imply affiliation with, sponsorship by, or endorsement by the trademark owner.