Common Glaze Materials (Table 3.1)
|Material||Formula||Molecular Weight||Convenient Formula||Equivalent Weight|
(Al2O3 , Molecular Weight 102, Expansion: 0.063, Fusion: 2040° C)
(SiO2, Molecular Weight: 60.1, Thermal Expansion: 0.035, Fusion: 1710° C)
Silica is the sine qua non of glaze formation: without silica, glaze making is not possible. While one can create sintered masses in the kiln in the absence of SiO2, such concoctions cannot rightly be called glazes.