This is unlike some raw materials which melt suddenly.
The Chemistry, Physics and Manufacturing of Glaze Frits
A detailed discussion of the oxides and their purposes, crystallization, phase separation, thermal expansion, solubility, opacity, matteness, batching, melting.
The melting temperature of ceramic glazes is a product of many complex factors. The manner of melting can be a slow softening or a sudden liquifying.
Frits are used in ceramic glazes for a wide range of reasons. They are man-made materials of controlled chemistry with many advantages or raw materials.
|Tests||Frit Fusibility Test|
|Oxides||B2O3 - Boric Oxide|
|Temperatures||Common frits begin melting (1400F-)|