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I cosmetic depilatories are used to eliminate unwanted hair.

hair removal can be performed in different ways, and is divided into:

or mechanical depilation hair removal, hair removal, physical, chemical depilation.

The mechanical hair removal is to complete tearing of hair from the root. The tear should be well executed to ensure the complete eradication of the fur, because often only causes a rupture of the hair shaft.

This is done by shaving and waxing hair removal strips.

The natural hair removal is a dermo-surgical technique, and not cosmetic. An electric current is used which allows to treat very delicate areas without attacking. To do that, the electrolysis, waxing and hair removal laser rapier.

The chemical depilation makes use of depilatory creams that are designed to completely destroy the hair fiber. These are mixtures of an alkaline buffer and reducing agents. The alkaline pH is indeed able to break the ionic bonds, hydrogen and the forces of Van Walls, the disulfide bond and the amide carbon.

This capability provides the destruction of the hair keratin. The particular composition

aggressive may also damage the skin, it is therefore necessary to respect the times indicated in the package (usually 5 to 7 minutes). In this period of time, very short, the preparation is not able to attack the skin, but only to destroy the hair.

These types of creams containing sulfides mercaptoacetic acid and alkaline . The latter is used at pH 12.5 and is less irritating to the skin than the alkaline sulphides. The concentration is routinely used by 4%, while the demolition of the hair depends on its structure. At pH 12.5 the time of demolition is about 4 minutes, Ph 10 instead is about 30 minutes.

Formulation

depilatory creams are O / W emulsions , which are removed by washing with water after the specified amount of minutes in the box.

The type of surfactant used is anion, in adequate amounts for the rest of the components.

The emulsifier must remove the excess sebum that covers the surface, facilitating the absorption of the preparation by the hair.