This shows that stability studies can often help over- come problems in the formulation of new cosmetic products, especially when further fluid components must be added to obtain satisfactory functionalisation (i.e. vegetable extracts). The refinement and balancing of the components of a formulation is a very complex issue that requires a number of carefully chosen steps to obtain a finished product that should be both psycho-rheologically pleas- ant and stable. The possibility of obtaining skin creams at room temperature, using Sepigel 305, not only makes the emulsification process easier but also prevents Phase Inversion Temperature (PIT) phenomena. For these reasons Sepigel 305 and similar compounds
can be considered as choice materials in cosmetics formulations.