All American Stained Glass

What is kilnforming?

FUSED or KILNFORMED glass is glass that has been fired (heat-processed) in a kiln at a range of high temperatures from 593 °C (1,099 °F) to 816 °C (1,501 °F). There are 3 main distinctions for temperature application and the resulting effect on the glass.


Firing in the lower ranges of these temperatures 593–677 °C (1,099–1,251 °F) is called SLUMPING.


Firing in the middle ranges of these temperatures 677–732 °C (1,251–1,350 °F) is considered "TACK FUSING".


Firing the glass at the higher spectrum of this range 732–816 °C (1,350–1,501 °F) is a "FULL FUSE".


"COLD WORKING" is work done to the glass outside of the kiln, while the glass is "cold". This includes, gringing, sandblasting, and polishing.


All of these techniques can be applied to one glass work in separate firings to add depth, relief and shape.


The results of years of practicing these techniques can be very rewarding.