Hydrated Silica

Hydrated silica is a form of silicon dioxide (SiO2) that contains chemically or physically bound water molecules (SiO2·nH2O). It is commonly produced by precipitation from sodium silicate solutions or by controlled hydration of silica gel. The material is amorphous, highly porous, and has a large surface area, which makes it an effective adsorbent. Due to its fine particle size and mild abrasiveness, hydrated silica is widely used in toothpaste as a polishing and cleaning agent to remove surface stains without damaging enamel. It is also used as a thickening, anti-caking, and stabilizing agent in food and pharmaceutical products. In chromatography and laboratory applications, hydrated silica (silica gel) is important as a stationary phase and drying agent because it can adsorb moisture and other polar substances. Its properties depend on the degree of hydration, surface chemistry, and pore structure, which can be adjusted for specific industrial and scientific uses today widely.