Silica (fumed) nanopowder (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.
SO 995 (OTTO) Silica, fumed, nanopowder, 99.9% - used in the synthesis of silicalite and in the catalytic growth of oxide and nitride.