Changes in the Mechanical Properties of Human Hair Under Various Conditions

The study investigated the tensile properties of human hair under conditions of hair coloring and chlorine exposure using samples from 10 individuals of the Chinese population. The results indicated significant differences in maximum load and ultimate tensile stress between normal hair and hair subjected to both conditions. Chlorine exposure significantly affected the strain at break, while hair coloring did not. Additionally, hair coloring significantly altered the modulus of elasticity, whereas chlorine exposure did not.