Healthy Hair by Jennifer Mary Marsh John Gray & Antonella Tosti

Author:Jennifer Mary Marsh, John Gray & Antonella Tosti
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Chemical degradation of hair due to heat will only occur if hair is heated above 150 °C. These temperatures can readily occur if heated straightening or curling irons are regularly used. With these implements on the highest setting, hair can reach temperatures of above 220 °C, especially if sections of hair are repeatedly straightened or hair is only slowly pulled through the flat iron. In addition, a critical degradation of protein takes place above 190 °C, which will involve cystine disulphide bond breakage. At very high levels of exposure to this temperature, melting of keratin can even occur. For example, Fig. 3.31 shows severe keratin degradation and hair breakage when hair is flat ironed for 3 min at 210 °C.

Fig. 3.31Melted keratin and hair breakage caused by excessive heat of a flat iron

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