Potassium Nitrate

Potassium Nitrate
Potassium Nitrate Potassium nitrate (coarse) 5kg
Potassium nitrate powder, commonly used for tree stump removal (use coarse grade) and pyrotechnics (fine or coarse grade).

Buy Potassium Nitrate

Weight Type Cost Quantity
1kg Coarse £8.20
1kg Fine £10.70
5kg Coarse £25.50
5kg Fine £53.60

Potassium nitrate is an oxidising salt in the form of a white powder which can be dissolved in water. Two variants are available to buy, both with the same chemical purity, one grade has been milled to a very fine powder, and the other is a coarse grade that is 20 - 80 mesh. Potassium nitrate is commonly used to provide the oxygen for combustion in pyrotechnics formulations.


Oxidiser- At high temperatures, especially in the presence of a reducer, potassium nitrate will decompose, liberating oxygen and promoting combustion. It is the main component of the pyrotechnic composition Black Powder, a formulation that has been in use since the 9th Century. Wood, charcoal, paper, tobacco and many other material can be treated with potassium nitrate to improve comustion.

Fertiliser - A source of potassium and nitrogen (NPK 13-0-44), both vital for leaf, stem and root growth as well as disease resistance. It is applied as a solution in water to plants in soil and aquariums.

Food - This potassium nitrate has not been declared fit for food use.

Tree Stump removal - The decay of wood is caused by fungi, potassium nitrate can be used to provide the best possible environment for fungal growth and wood decay. Cut the stump as close to the ground as possible and drill several large holes deep into the wood, then liberally apply potassium nitrate powder to the stump and down the holes. Keep the stump moist to provide best conditions.


Purity: >99.3% KNO3, may contain anticaking agent.
Particle size: Coarse around 30 mesh, Fine typically 49% < 77 micron.
Colour: White.
Odour: Odourless
Solvent: Water: 13g at 0°C, 32g at 20°C, 170g at 80°C, 250g at 100°C (in 100g of water).
Formula: KNO3
Melting Point: 333ºC
Boiling Point: 400ºC



May intensify fire; oxidiser.
General: Read label before use. Keep out of reach of children.
Prevention: Keep away from heat/open flames/hot surfaces. — No smoking. Keep away from clothing/combustible materials. Take any precaution to avoid mixing with combustibles. Wear protective gloves/protective clothing/eye protection/face protection.
Response: In case of fire: Use for extinction: CO2, powder or water spray.
Disposal: Dispose of contents/container in accordance with Environmental Protection and Hazardous Waste Regulations.


Potassium Nitrate MSDS

Product Identifiers

1kg Fine: 0029882791196, 1kg Coarse: 0029882791820, 5kg Coarse: 0029882796870, 5kg Fine: 0029882796887,
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