Potassium permanganate

Potassium permanganate (CAS 7722-64-7), also known commercially as Condy's crystals, is a strong inorganic oxidizing agent.

Where is Potassium permanganate used?

• Water treatment: oxidizes dissolved iron, manganese and hydrogen sulfide for removal before filtration
• Textile and paper: bleaching agent for uniform whitening of fibers and pulp
• Mining: effluent treatment to neutralize cyanide-bearing wastewater before discharge
• Pharmaceutical compounders rely on its biocidal activity for antiseptic preparations.
• Wastewater treatment by oxidation and deodorization of industrial discharges, such as paint and fish processing.
• Prevention of algae growth in raw water reservoirs.
• Addition to bags containing bananas or tomatoes to oxidize ethylene to ethylene glycol, stopping ripening and extending shelf life.

Good to know: Pharmaceutical-grade material meets USP and BP specifications.

Formulation notes

• Dose added to water must be controlled to avoid excess that would color the water pink.
• Reaction with glycerine, after a short induction period, can be violent and produces flames.

Typical specification

• No melting point; decomposes from 240 °C to green potassium manganate, manganese dioxide, potassium oxide and oxygen.
• Moderately soluble in water and forms an intense purple solution even at low concentrations.

Regulatory status

• Classified as an oxidizing solid/liquid with hazard statement H272 (may intensify fire; oxidizer).

Storage, packaging and handling

• Gives exothermic and sometimes violent reactions with some compounds, such as hydrogen peroxide.
• Should be stored in a cool, dry place away from direct light and heat sources.

Frequently asked questions about Potassium permanganate

What are the limitations of potassium permanganate in drinking water treatment?

In drinking water treatment processes, potassium permanganate can be used but requires manganese dioxide removal filters, and its colour and bitter taste mean ozone and UV processes are preferred.

Technical content is compiled and updated by the SoleChem product team from public technical sources; the certificate of analysis (COA) governs product-specific specifications.