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Casting spot and / or casting cords
When the slurry get in contact with the mold, a segregation of particles can occur creating defect after firing. This segregation can find his origins in the orientation of particles during the filling of the mold.
The rheological set up of the slurry remains the main driver to control and avoid these defects, usually generated by a too fluid or low thixotropic slip.
Increasing the density of the suspension or the thixotropy reduce the occurrence of the defect. The use of a kaolin like Grolleg allows to work at higher density and having a controlled thixotropy.