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Potassium silicate is a highly alkaline colourless solution with a formula K2SiO3. It is used in woodwork of houses to secure or protection against catching fire. 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. In horticulture, potassium silicate is used as a soluble source of potassium and silica. It makes the growing medium more alkaline. Some metal cleaning formulations use potassium silicate, which also serves as a corrosion inhibitor.