Emulsions used in personal care and cosmetic formulations--both oil-in-water (O/W) and water-in-oil (W/O) types--need to satisfy a number of criteria. They must demonstrate physical stability over 2-3 years under various conditions, such as temperature variation and stress induced by vibration during transportation. They must also maintian the proper consistency (rheology) to achieve good skin-feel, spreading and delivery of actives. Finally, the safety of the ingredient used must be assured to avoid any skin irritation or adverse effects on contact with the skin.
Correlation of Long-term Physical Stability of Emulsions with the Short-term Rheological Measurements
December 23, 2005 | Contact Author | By: Tharwat Tadros, Jeremie Nestor, Marie Claire-Taelman and Robert Smits, Uniqema
Abstract: Three short-term rheological measurements on some model personal care emulsions showed good correlation with long-term physical instability of the emulsions. Use of these rheological measurements can shorten the time to test the stability of new formulations.
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