This image is taken from Pate de Verre and Kiln Casting of Glass, by Jim Kervin and Dan Fenton, Glass Wear Studios, 2002, p.27.
It shows in graphic form how the viscosity of glass decreases with increases in temperature. The temperatures are given in Fahrenheit.
The coefficient of expansion also changes with temperature.
It shows in graphic form how the viscosity of glass decreases with increases in temperature. The temperatures are given in Fahrenheit.
The coefficient of expansion also changes with temperature.
 |
| This graph is also from Kervin and Fenton |
It is these two forces of viscosity and expansion that must be balanced around the annealing point to give a stable and compatible range of fusing glass.
No comments:
Post a Comment