Despite it sounding a bit weird putting, in a same title and in terms of equality, ‘softness and moisturization’, for the most of the consumers, the way of identifying how the products deliver these benefits is practically the same: friction!
Recently, TRI, the biggest tests and hair researches Institute, published an article (“Water content and Moisturization”) in which it demystifies the idea of moisturization with water content of the fiber and associates this attribute with the idea of friction to the touch. In addition, moisturization, in the same article, is also associated with the idea of softness (or smoothness) and conditioning.
In addition, chapter 10 of the renowned book “Chemical and Physical behavior of Human Hair” explains, in a very clear way, the idea of moisturization, smoothness and softness with Hair Handle or Feel, that is, with the fact that these attributes are associated to the touch and handling of the hair.
Thus, a precise evaluation of these attributes needs to take into account the friction when the consumer handles the hair, whether with a comb, brush or with the hands.
In which the hair slides in a device containing two combs and the force of friction between the comb and the swatch is obtained and, later, evaluated. The product that presents less force of friction is also the one considered smoother and more moisturized;
In which the hair slides one over the other under the action of a standard weight, so as to simulate the sliding of a hand. The force of friction is obtained and, then, evaluated. The product that presents less force of friction throughout the sliding is also the one considered softer and moisturized.