Cosmetics | Determining the Yield Point and Viscosity of Hair Gel with RheolabQC

This report gives insight into rheological characterizations of cosmetic products using hair gel as an example. The viscosity of hair gel is an important parameter during its production while the viscoelastic properties of the end product are decisive for the customer's happiness.

Hair gel must meet high standards: it should be moisture-resistant and provide a strong, long-lasting hold without leaving a customer’s hands or hair sticky. As these properties are connected to the rheological character of a hair gel, this report describes methods for characterization. The yield point not only affects the gel's consistency during application but also how the ingredients and final product are processed during manufacturing (such as pumping and filling).

Experimental Setup

Samples

A gel is a finely dispersed system consisting of at least one solid and one liquid phase, which disperse amongst each other and form a three-dimensional network. Due to their consistency, gels can be used as a support material for ointments, creams or as hair gel. Agarose, guar gum and sodium alginate commonly build the base to form a gel in cosmetics.

Measurement configuration

Measurements were performed on the Anton Paar RheolabQC with CC27 according to ISO 3219, a norm defining the cylinder geometry and the cup diameter to bob diameter ratio as 1.0847. It sets an industrial standard for the measuring gap, independent of the measuring system size and manufacturer. The Peltier temperature device C-PTD 180/AIR/QC enables quick and accurate temperature control in a range from 0 °C to 180 °C. The RheoCompass™ software can apply defined temperature profiles during the measurement. Such profiles allow to observe temperature dependency of gels.

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