Silica gel is the most commonly used desiccant in the food and pharmaceutical packing industry. It is US FDA approved and also very safe. Silica gel is also called silica aerogel or hydrated silica. Silica gel, along with being a good desiccant in food packaging industry is also used in many procedures in chemistry. It is used in chromatography as a stationary phase. Different particles of different sizes are used for achieving a desired separation of certain molecular sizes in the process of column chromatography. Silica Gel Powder is used in Pharma & Chemical Research Laboratories for column chromatography.