Joint consideration has been made of viscous behavior (flow and thixotropy) and viscoelastic behavior
(oscillatory testing). Rheological measurements were fitted to different rheological and empirical
mathematical models, and a total of 11 parameters were generated. Based on these parameters and the
use of fuzzy clustering and the c-means method, an objective classification of all the products was
obtained. Our results correspond to five different classes, one more than the four established by other
authors. The five defined classes have been named in a way similar to those most commonly used in the
literature.