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© 1976 Society of Cosmetic Chemists
Journal of the Society of Cosmetic Chemists, Vol. 27, No. 12, 579-592


Observations on the Cutting of Beard Hair
Donald E. Deem , Martin M. Rieger

ABSTRACT

Synopsis

A device is described which permits measurement of the force required to CUT a BEARD HAIR FIBER under a variety of conditions. Studies with this device show that the force required to cut wet beard fibers with commercial razor blades is about 65 per cent less than that of dry fibers. Beard hair is almost completely hydrated by exposure to water for about 2 minutes at room temperature, and this hydration is accelerated by an increase in temperature. The force required to cut a beard hair increases with increasing fiber cross-sectional area, but this correlation is not perfect. The force required to cut beard hair is not lowered below that in water by the presence of a wetting agent, a shaving cream, or a soap solution. The force required to cut wet beard hair with a razor blade is lowered significantly by very severe attack on the fiber. On the other hand, the force required to cut beard hair increases as the rate of blade travel increases.

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© 1976 Society of Cosmetic Chemists
Journal of the Society of Cosmetic Chemists