Abstract:

A new method for rapid evaluation of emulsion stability was developed. The technique is based on elec. cond. measurements during non-destructive short heating-cooling-heating cycles carried out on cosmetic viscous emulsions. The cond. curve obtained during the second heating cycle is lower and almost parallel to the first curve. The bigger the cond. difference between the two heating curves, the lower is the stability of the emulsion. A relative stability index, $Δ$/h, indicating relative change in cond. between two cycles was elaborated allowing easy comparison of emulsion stabilities having different initial cond. The method was compared to std. stability tests with good correlation. [on SciFinder(R)]