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© 1978 Society of Cosmetic Chemists
Journal of the Society of Cosmetic Chemists, Vol. 29, No. 8, 449-467


Fractography of human hair
G. H. Henderson , G. M. Karg , J. J. O'Neill

ABSTRACT

Synopsis

Scanning electron microscopy and optical microscopy show that when HUMAN HAIR is extended in water the cuticle usually suffers multiple circumferential FRACTURE with local separation from the cortex before the latter fractures. The cortex fracture is typically smooth and perpendicular to the fiber axis. In the dry state the fracture is more irregular indicating axial splitting of the cortex before or during fracture without prior failure of the cuticle. Except for the cuticle-cortex separation which occurs in wet extension, fracture surfaces do not show a strong tendency to follow cell boundaries.

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© 1978 Society of Cosmetic Chemists
Journal of the Society of Cosmetic Chemists