Coating Terms

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Separation of a substance’s neighbouring particles from each other by applying different parallel forces causing different particle velocities. (e.g., knives of scissors cut a piece of paper by applying forces in two opposite directions normal to paper surface. These forces are called shear forces. Shear force is applied to the paint formulation by mixer blade while mixing.)
Fluids that undergo a viscosity decrease upon exposure to shear force (e.g., mixing or shaking). They regain their original viscosity after removal of the shear force. Pseudoplastic fluids regaining their viscosity a while after shear force removal are called thixotropic fluids. An important portion of coatings demonstrate thixotropic behaviour.
Fluids that undergo a viscosity increase upon exposure to shear force (e.g., mixing or shaking). They regain their original viscosity after removal of the shear force. Some pigment pastes with high pigment loading demonstrate shear thickening behaviour.