The Aerosil Fumed Silica Powder is also known as pyrogenic silica. They are made using a flame that consists of microscopic droplets of amorphous silica fused into 3- D secondary particles which then agglomerate into tertiary particles. The Aerosil Fumed Silica Powder finds its usage in various industries. They are available like powder and has an extremely low bulk density and high surface area. They are also used to increase the viscosity, thixotropic behavior when used as a thickener or reinforcing filler.