Modern sanitaryware casting (especially high-pressure slip casting) demands tight rheological control. The casting slurry (slip) must flow freely to fill intricate molds, yet build uniform wall thicknesses rapidly.

Deflocculation Mechanics Casting slips are deflocculated using sodium silicate or polycarbonates. Deflocculants introduce negative charges onto clay particle edges, causing mutual repulsion and reducing slip viscosity at high solids loading (typically 70-75% solids).

Rheology & Consistency - **Thixotropy**: The slip must exhibit thixotropic behavior—gel-like stability when static, flowing freely when pumped or vibrated. - **Washed Clay Influence**: Grit or free quartz particles alter slip casting rates and introduce structural stress points. Using hydraulically washed clays with sifting limits (+45 Micron < 0.05%) ensures uniform casting rates and prevents firing cracks.