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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...

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Experimental determination of a procedure for casting a solid coloured emulsion.

S Germaneau¹, H de Clermont-Gallerande, C Chevalier

¹LVMH Recherche Parfums et Cosmétiques, Cedex, France. sgermaneau@diormail.com

International Journal of Cosmetic Science

|May 23, 2008

Summary

This study optimized the casting of solid water/oil (W/O) emulsion foundations. Optimal results were achieved with a casting temperature of 65°C and cooling at 4°C to preserve cosmetic qualities.

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Area of Science:

Cosmetic Science and Formulation
Materials Science
Chemical Engineering

Background:

Solid water/oil (W/O) emulsion foundations require precise manufacturing to maintain desired properties.
Preserving organoleptic qualities (e.g., hardness, texture, cosmetic feel) and water content is crucial for product performance.
Industrial casting parameters significantly influence the final characteristics of W/O emulsions.

Purpose of the Study:

To establish an optimized experimental procedure for casting solid W/O emulsion foundations.
To investigate the impact of industrial casting and cooling parameters on emulsion stability and quality.
To determine ideal temperature conditions for casting and cooling to ensure product integrity.

Main Methods:

Investigated two key industrial parameters: casting bulk temperature and mould cooling type.
Systematically varied casting temperatures and cooling methods for W/O emulsion foundations.
Measured critical physical properties, including hardness and melting point, for each trial.

Main Results:

Identified an optimal casting temperature of 65°C for the bulk emulsion.
Determined that a cooling temperature of 4°C in the mould yields the best results.
These conditions successfully preserved the organoleptic qualities and water percentage of the foundation.

Conclusions:

The study successfully defined optimal casting and cooling parameters for solid W/O emulsion foundations.
A casting temperature of 65°C and a cooling temperature of 4°C are recommended for industrial production.
Adherence to these parameters ensures the preservation of essential cosmetic properties and formula stability.