FUMED SILICA

Fumed silica (CAS number 112945-52-5), also known as pyrogenic silica because it is produced in a flame,
consists of microscopic droplets of amorphous silica fused into branched, chainlike,
three-dimensional secondary particles which then agglomerate into tertiary particles.
The resulting powder has an extremely low bulk density and high surface area.
Its three-dimensional structure results in viscosity-increasing,
thixotropic behavior when used as a thickener or reinforcing filler