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© 1978 Society of Cosmetic Chemists
Journal of the Society of Cosmetic Chemists, Vol. 29, No. 8, 469-485


Stiffness of human hair fibers
G. V. Scott , C. R. Robbins

ABSTRACT

Synopsis

The STIFFNESS of COMPONENT FIBERS is known to be important to the behavior of a fiber mass, but measurements are lacking in the cosmetic literature probably because of experimental difficulties with published methods. Recognizing this, we devised a simple method to compare fibers for stiffness.

A fiber with a small weight on each end is draped over a wire and the distance (“D”) between the vertical legs is measured. Fibers with a wide range of thicknesses clearly showed that values of “D” relate linearly to cross-sectional areas, as expected of “stiffness.” This prompted a theoretical study which yielded equations in terms of “D” for calculating, e.g., elastic bending moduli and shapes of hanging fibers.

Empirical and theoretical guides are given for selection of wire diameter and fiber weights. The average elastic modulus for bending fibers, assumed round in cross section, is approximately equal to that for stretching the same fibers. Fiber stiffness is affected by humidity and chemical treatments but is relatively unaffected by shampoos.

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