Fused glass is a term used to describe glass that has been fired (heat-processed)
in a kiln at a range of high
temperatures. There are three main distinctions for temperature application and
the resulting effect on the glass.
Firing in the lower ranges of these temperatures 1225 degrees
centigrade is called “slumping.” Firing in the middle ranges of these
temperatures 1380 degrees centigrade is considered "tack fusing.” Firing
the glass at the higher spectrum of this range 1480 degrees centigrade is a
All of these techniques can be applied to one glass work in
separate firings to add depth, relief and shape.