Rheological behavior marked by a specific flow limit, i.e. by a shear stress below which the fluid acts as a solid. In other words: when the fluid is resting, it is very compact, but when it undergoes to a movement, the fluid softens becoming more liquid.

In ceramics, the most representative pseudo-plastic fluids are slurries for ceramic body and grit suspensions. These fluids must be able to keep the grit in suspension while they are resting, behaving (we could say) as a solid. On the other side, during application, the suspension must develop a de-structuring process, behaving as a pseudo-plastic fluid: the viscosity decreases while thevelocity gradient gradually increases.

During the application by means of spray systems, the fluid undergoes to a very high speed, thus leading to a very low viscosity value and, therefore, allowing a proper nebulization.