Calcium borate is a ceramic compound used mainly as a flux in ceramic glazes. Its main function is to facilitate the melting of the ingredients at low and medium temperatures, which allows the glaze to melt more efficiently. It also improves the transparency of glazes and contributes to the creation of smooth and glossy finishes. Its ability to stabilize the ceramic mixture is essential, as it prevents the glaze from becoming excessively fluid or sliding off the surface during firing, ensuring uniform adhesion.
Calcium borate is particularly useful for creating transparent glazes that allow painted or sgraffito decorations to stand out beneath the glazed surface. This is because its fluxing action not only improves the quality of the finish, but also brings out the details and colors of the applied artistic decorations. In addition, calcium borate helps to reduce the risk of cracking or discoloration in ceramics.
Interesting Fact
It is also used in agriculture as a fertilizer to correct calcium and boron deficiencies in plants.
Helpful Tip
To obtain a translucent, glossy glaze at low temperatures, consider adding calcium borate in small amounts. Be aware that excessive use may make the glaze too shiny or slippery.
