Glass fusing and slumping are often referred to as warm glass, glass art fusion or kiln formed glass methods. Firings usually range from 700-820°C. A kiln is used to make the glass molten and to join two or more pieces of together.

The test pieces below show the effect of kiln temperature on glass.

samples of coloured glass fused at different temperatures
Test fuses: left to right – 700°C, 760°C, 780°C, 800°C & 820°C