![]() One of the shampoos was for men, one for women and one for children (infants). Three different commercial shampoos were tested on a viscotester rheometer with 35 mm plate/plate geometries to measure the thickness or the fluid’s resistance to flow. Those specific rheological properties will determine the richness or creaminess of the shampoo, thereby appealing to either male or female customers. Today we will discuss how we tested three different commercial shampoos to show how products for different customer groups differ rheologically and how to determine the parameter viscosity to ensure the shampoo meets customer expectations. Each product type is made differently, depending on the market. Shampoo formulations are complex, consisting of about 80 wt.% water and the remainder being surfactants, viscosity modifiers, preservatives, fragrances and colorants and performance additives. The viscosity of the shampoo not only affects the cleaning efficiency and user perception of the quality, but it also influences the foaming properties, production filling, packaging, storage and long-term stability of the product. One main rheological parameter that correlates with the thickness and flow properties of a shampoo is the viscosity (it’s resistance to flow). ![]() Shampoo is definitely a product in which flow is part of its quality perception. Rheology is the study of the flow of materials, and the deformation of materials under force and friction. There are certain expectations whether the shampoo is for men, women, or babies. It has to feel luxurious but be able to flow out of the bottle, but not be so runny that product is wasted. In our last article, we discussed how consumers have expectations when it comes to shampoo.
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