Menu
Home
People
Places
Arts
History
Plants & Animals
Science
Life & Culture
Technology
Reference.org
Silica fume
open-in-new
<p>Silica fume, also known as microsilica, (CAS number 69012-64-2, EINECS number 273-761-1) is an <a href="/facts/Amorphous/YTIzmrR0">amorphous</a> (non-crystalline) polymorph of <a href="/facts/Silicon_dioxide/A3WILp6J">silicon dioxide</a>, <a href="/facts/Silica/A3WILp6J">silica</a>. It is an ultrafine powder collected as a by-product of the silicon and ferrosilicon alloy production and consists of spherical particles with an average particle diameter of 150 nm. The main field of application is as <a href="/facts/Pozzolan/hYvjy2vQ">pozzolanic</a> material for high performance concrete. </p><p>It is sometimes confused with <a href="/facts/Fumed_silica/fMM6HJ04">fumed silica</a> (also known as pyrogenic silica, CAS number 112945-52-5). However, the production process, particle characteristics and fields of application of fumed silica are all different from those of silica fume. </p>