Potassium Silicate

Potassium silicate is the name for a family of inorganic compounds. The most common potassium silicate has the formula K2SiO3, samples of which contain varying amounts of water. These are white solids or colorless solutions..

In horticulture, potassium silicate is used as a soluble source of potassium and silica. It makes the growing medium more alkaline.  

Impregnation of wood with a potassium silicate solution is an easy and low cost way for rendering the woodwork of houses secure against catching fire. The woodwork is first saturated with a diluted and nearly neutral solution of potash silicate. After drying, one or two coats of a more concentrated solution are usually applied

Some metal cleaning formulations use potassium silicate, which also serves as a corrosion inhibitor.[4] It also finds various uses in the fabrication of welding rods or even of cosmetics.