Zircon sand Zircon Flours are white powdery minerals that are found in nature. These minerals have the following properties of Zircon: Chemically inert nature Water insoluble Stable in temperature variations Insoluble in dilute acids and concentrates These products are widely used in high temperature applications such as in casting shell moulds, in foundry cores, brick kilns, for coating welding rods, in glass and ceramic industry, nuclear plants and for abrasive cleaning.