The Physical Properties of Hair

What makes hair flexible, stretchy, shiny and soft

Hair is remarkably resistant

Measuring stretch

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The extensometer used in the L’Oréal laboratories enables the elastic properties of the fibre to be measured. ©L’Oréal Research

The hair’s surface

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The hair shaft seen under the electron microscope has a characteristic protective envelope, the cuticle, which is composed of completely keratinised cells arranged like tiles on a roof. ©L’Oréal Research

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