Use as ultra-pure beads for cell disintegration and autogenous grinding; grinding of conductive pastes, glass paints and high-purity silicate materials; in the laboratory as carrier material with bioactive or catalytic surface; as filler material in the cosmetics industry, semi-conductor industry and pharmaceutical industry; as radiation conductor in the UV range (disinfection); optical sphere/half sphere for UV sources/wave guides; photovoltaic sphere with transmission of 170 – 5,000 nm; filter material for very high temperatures and many other applications.