Chemical like silicon dioxide.
Silica sand (99 5% silicon dioxide sio2).
Silicon monoxide(sio), silicon dioxide(sio2), aluminum oxide, magnesium oxide (mgo), magnesium fluoride(mgf2), tantalum oxide (ta2o5), titanium sesquioxide(ti2o3), titanium penoxide(ti3o5), titanium monoxide(tio), titanium dioxide(tio2), yttrium oxide(y2o3), zinc oxide (zno), zirconium oxide(zro2), aluminum, fluoride(alf3), zr(99.9%), cu(99.9%);zn(99.9%), crucible: quartz crucible; alumina crucible; boron nitride crucible; graphite crucible; tungsten crucibles, ceramic devices.
