Coating Terms

Search For Terms:
Term
Description
General term for substances that demonstrate flowing behaviour. Liquids and gases are fluids.
Fluids that undergo a viscosity increase upon exposure to shear force (e.g., mixing or applying pressure) See Shear thickening fluids
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.
Fluids having viscosity independent of shear stress. Since these types of fluids behave according to Newton's model, they are called “Newtonian fluids”.
Viscosity of some fluids may change according to the shear stress applied. These types of fluids are called “Non-newtonian fluids”. Non-newtonian fluids exhibit shear- thinning   (Pseudoplastic), shear-thickening (Dilatant) or plastic flow behaviours.
See Also Shear thinning fluids, Shear thickening fluids, thixotropy