The Relation between the Subjective Evaluation and the both Compression and Surface Properties of Cosmetic Sponges

Abstract

The relationships between the subjective measurement, such as “Elasticity”, “Smoothness” and “Adhesibility of the foundation on a sponge”, and the compression and surface properties of sponges were investigated. On the basis of experimental and theoretical considerations, the three characteristic values were presented to predict the sensorial evaluation of sponges.
(1) Characteristic values of elasticity for the prediction of “Elasticity”: E_e (=E/RC, where E is the elastic modulus and RC is resilience)
(2) Characteristic values of surface smoothness for the prediction of “Smoothness”: S_m (=D_n•E_e where D_n is the degree of surface finess obtained from the surface roughness (SMD) and its wave analysis)
(3) Characteristic values of adhesibility for the evaluation of “Adhesibility of the foundation on a sponge”: A_d(=SMD•E_e)