<P> The kinetic process of destabilisation can be rather long (up to several months or even years for some products) and it is often required for the formulator to use further accelerating methods in order to reach reasonable development time for new product design . Thermal methods are the most commonly used and consists in increasing temperature to accelerate destabilisation (below critical temperatures of phase and degradation). Temperature affects not only the viscosity, but also interfacial tension in the case of non-ionic surfactants or more generally interactions forces inside the system . Storing a dispersion at high temperatures enables simulation of real life conditions for a product (e.g. tube of sunscreen cream in a car in the summer), but also to accelerate destabilisation processes up to 200 times including vibration, centrifugation and agitation are sometimes used . They subject the product to different forces that pushes the particles / film drainage . However, some emulsions would never coalesce in normal gravity, while they do under artificial gravity . Moreover, segregation of different populations of particles have been highlighted when using centrifugation and vibration . Common examples of suspensions include: </P> <Ul> <Li> Mud or muddy water: where soil, clay, or silt particles are suspended in water </Li> <Li> Flour suspended in water . </Li> </Ul> <Li> Mud or muddy water: where soil, clay, or silt particles are suspended in water </Li> <Li> Flour suspended in water . </Li>

A mixture in which the materials are suspended and not dissolved