Productgroup
Perm products
Description
If the hair is to be permanently brought into a new shape, the hair structure must be softened, the hair must be reshaped and subsequently hardened again. To open the structure, a reducing agent is used (eg salts of thioglycolic acid, thiolactic acid, CYSTEINE or sulphite). For the recombination and / or fixing of the bonds an oxidation is necessary (mostly by hydrogen peroxide). The pH value of the ready-for-use reducing agent solutions ranges between 7 and 9.5. It is adjusted with an alkalising agent (ammonia, ammonium bicarbonate, monoethanol amine). Further components of the perm lotion are wetting agents, solubilisers and, as care components, proteins and polymers. Fragrances ensure a covering of the unpleasant odour caused by the thiols. After the softening and application of curlers the reshaped hair must be set in the new form. This is carried out by means of a hydrogen peroxide containing fixing agent. Apart from hydrogen peroxide, the fixing agent contains neutralising acids (eg citric acid) as well as care substances. Alkaline, mildly alkaline, neutral as well as perm products with changing pH value are commercially available. They are offered in liquid or creamy form, as foam or two-phase products. All of these perm systems are part of the so-called cold perm products. By adding heat, the exposure time can be reduced. Foam perms contain propellants or air included by foaming.