Fusion glass, Kiln formed glass is usually referred to as warm glass, and can be either made up from a single piece of glass that is slumped into or over a mould or different colors and sheets of glass fused together. The process of hot glass is highly scientific & in this, the types of glass and temperatures that they must be fired at is quite a complicated operation. Art glass that is kiln formed usually take the form of dishes, plates or tiles. Glass that is fused in a kiln must be of the same co-efficient of expansion (CoE). If glass that does not have the same CoE is used for fusing, the differing rates of contraction will cause minute stress fractures to form and, over time, these fractures will cause a piece to crack. The use of polarizing filters to inspect the work will determine if stress fractures are present.

Fusion glass, Kiln formed glass is usually referred to as warm glass, and can be either made up from a single piece of glass that is slumped into or over a mould or different colors and sheets of glass fused together. The process of hot glass is highly scientific & in this, the types of glass and temperatures that they must be fired at is quite a complicated operation. Art glass that is kiln formed usually take the form of dishes, plates or tiles. Glass that is fused in a kiln must be of the same co-efficient of expansion (CoE). If glass that does not have the same CoE is used for fusing, the differing rates of contraction will cause minute stress fractures to form and, over time, these fractures will cause a piece to crack. The use of polarizing filters to inspect the work will determine if stress fractures are present.