Frictional Properties of Soaps with the Addition of Ground Hazelnut Shells

The search for new technologies and related new biological materials for use in the cosmetics industry requires many studies and analyses of not only chemical but also physical properties. This study attempts to assess the properties of soap produced with the addition of crushed hazelnut shells. This additive is intended to improve the friction properties of the soap, which in turn enhances the quality of removing impurities from the skin. Friction tests for wet and dry skin were performed on an appropriately designed measuring station using the Texture Analyser XT plus device. The obtained results indicate an increase in dynamic friction value compared to the control sample. This work proposes an unconventional use of ground hazelnut shells as one of the additives in soap production to improve its quality.