Cracking or breaking of pots when cold draghts are allowed to enter the kiln. Can also be caused by the free silica in the body being too fine.
The cracking of fired pots during cooling caused by uneven or too rapid cooling. There are two critical points in a cooling cycle which must not be passed too quickly one is between 575°C and 550°C and the other is 225°C. At these points silica in the body undergoes certain changes which are accompanied by a change of volume. If cooling is fast ...
Cracks or cracking in the clay caused by the too rapid cooling or heating of ware, and due to thermal stresses set up in the body.
Cracking of pots due to stress built up by Silica Inversion in the firing. Rapid and uneven heating and cooling of the pot in firing is the most common cause, pots made from uneven thicknesses of clay are also at risk and poor glaze fit can also be a cause
cracking and breaking of pottery, usually during the firing process. This is usually caused by uneven heating and cooling.