What is Potassium Nitrate?
Potassium Nitrate (KNO₃), commonly known as Saltpetre or Nitre, is a naturally occurring mineral and chemical compound that is an important source of both potassium and nitrogen — two essential plant macronutrients. It appears as a white crystalline powder and is highly soluble in water. It is a mild oxidising agent that finds application across agriculture, food preservation, glass manufacturing, and industrial heat treatment.
Polychem Industries supplies Potassium Nitrate in industrial grade and agricultural grade to fertiliser manufacturers, glass producers, food processors, and industrial users across India and internationally. Its dual role as both a potassium and nitrogen source makes it particularly valued in specialty fertiliser formulations and hydroponics.
Oxidiser Safety Notice
Potassium Nitrate is an oxidising agent and should be stored away from combustible materials, flammable substances, and organic materials. It can accelerate fires if it comes into contact with combustibles. Store in a cool, dry, well-ventilated area in sealed containers. Handle with appropriate PPE and follow all applicable fire safety regulations.
Available Grades
| Grade | Form | Purity | Standard | Applications |
|---|---|---|---|---|
| Industrial Grade | White Crystalline Powder / Granules | 99% | Industrial | Glass, heat treatment salts, fireworks, industrial |
| Agricultural Grade | White Granules / Prills | 98% | Fertiliser Standard | Specialty fertilisers, fertigation, hydroponics |
| Food Grade | White Crystalline Powder | 99.5% | FSSAI / FCC | Meat curing, food preservation (E252) |
Applications & Uses
Specialty Fertilisers
An excellent source of both potassium (K) and nitrate nitrogen (N) for plants. Widely used in high-value crop fertigation, foliar sprays, and hydroponics where a chloride-free, fully water-soluble potassium and nitrogen source is needed.
Glass Manufacturing
Used as a refining agent and oxidiser in glass production. Helps remove bubbles and impurities from molten glass, and is used in the production of specialty glass including TV screens and optical glass.
Heat Treatment Salts
Used in molten salt baths for the heat treatment of metals including quenching, tempering, and annealing processes. Potassium Nitrate salt baths are operated at temperatures of 150–550°C.
Food Preservation
Food Grade KNO₃ (E252) is used as a curing agent in processed meats such as ham, bacon, and salami. It inhibits the growth of harmful bacteria including Clostridium botulinum and contributes to the characteristic colour and flavour of cured meats.
Hydroponics & Fertigation
A preferred potassium-nitrogen source in hydroponic nutrient solutions and fertigation systems due to its complete water solubility, lack of chloride, and balanced N:K ratio that suits most crop requirements.
Chemical Synthesis
Used as an oxidising agent and potassium source in chemical manufacturing, in the production of other potassium compounds, and as a laboratory reagent for analytical and synthetic chemistry.
Technical Specifications
Potassium Nitrate — Key Properties
Why Source Potassium Nitrate from Polychem Industries?
- Industrial, Agricultural, and Food Grade available for all applications
- Certificate of Analysis provided with every supply
- Consistent quality for glass manufacturers and fertiliser producers
- Reliable bulk supply with competitive pricing
- Experienced in handling and shipping regulated industrial chemicals
- Export documentation experience for international shipments
