1. Colloidal silica is a white, fluffy, sand free fine powder.
2. Wet silicon is a white, fluffy powder or white microporous beads or particles. Moisture absorbing or easily absorbed from the air, odorless, tasteless, with a relative density of 2.2 to 2.6, melting point in degrees Celsius, insoluble in water, acid, and organic solvents, soluble in hydrofluoric acid and hot concentrated alkaline solution.
