Cosmetics | Determining the Yield Point and Viscosity of Hair Gel with the RheolabQC
This application report gives an insight to rheological characterizations of cosmetic products using hair gel as an example. The viscosity of a hair gel is a particularly important parameter, especially during production. The viscoelastic properties on the other hand are important for the customer's evaluation of the end product.
Hair has a particular importance for us: It is an expression of beauty and individuality, but can also show affiliation to a culture or group. Modern hair gel must meet high requirements: Extremely strong, moisture-resistant and long-lasting hold which does not lead to sticky hands or sticky hair.
This report describes a measuring method for the rheological assessment of hair gel. The “yield point“ influences the processability of the ingredients and the end product during the manufacturing process (pumping, filling) and also the consistence during application (gel character, the way the gel feels in the hand).
Gel is an abbreviation of “gelatin“ and has the same latin root as “jelly“ (thickened fruit or meat juice).
A gel (from the latin “gelu“) 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.
The consistence is between liquid and solid. A gel is neither liquid, like oil, nor solid, like a rubber ball.
Gel can be used as the support material for ointments, creams or as hair gel to shape a hair style. Agarose, guar gum and sodium alginate are frequently used to form gel in cosmetics.
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