Acts as a framework for the fired material, increasing mechanical strength and resistance to thermal shock.
Proportions vary based on the intended use and firing temperature: Porcelain
Typically 50% kaolin, 25% quartz, and 25% feldspar. Acts as a framework for the fired material,
Acts as a "flux," melting during firing to create a glassy matrix that bonds the other ingredients together, making the final piece non-porous (vitrified). making the final piece non-porous (vitrified).