High Purity Antimony(V) Oxide Powder Antimony(V) Oxide or Antimony Pentoxide is is a highly insoluble thermally stable Antimony source suitable for glass, optic and ceramic applications. They are typically insoluble in aqueous solutions (water) and extremely stable making them useful in ceramic structures as simple as producing clay bowls to advanced electronics and in light weight structural components in aerospace and electrochemical applications such as fuel cells in which they exhibit ionic conductivity.