All the mechanical and chemical processes applied after finishing and coloring processes in textile products are called finishing processes or finishing processes. In leather products, it is aimed to change and improve the appearance and attitude of the leather product, which is intended for finishing processes after coloring. However, the same finishing process is not applied to all kinds of textile products. A number of criteria, measures and limitations must be taken into account when finishing operations. In terms of leather products, these are many properties such as type, size, thickness, pH value, tear strength and tear strength of the skin.

However, the important point is that the applied finish fits into the skin. It is sticking with another phrase. Residues that remain on the skin that are not well cleaned prior to the finishing process, such as deterioration of the finishing agents used or improper application of the processing conditions, may not have adhered to the skin.

Accredited laboratories carry out tests and analyzes in order to determine the adhesion property of the skin within the scope of specific tests. These studies are based on standards published by domestic and foreign organizations. The standards considered for the determination of adhesions in the skin are:

• TS EN ISO 11644 Leather - Test for the adhesion of finishing
• ISO 11644 (IULTCS / IUF 470) Leather - Topcoat adhesion test

Depending on the shape and size of the skin, the finish can be detached during use of the skin, as it adheres to a very small portion or part of the skin surface. If the finishing process is carried out in several layers, then the separation may be between the layers. For example, there may be separations between the coating base and the painted layer. This standard specifies a method for measuring the adhesion strength of the finish to the skin or the adhesion strength of two adjacent finishing layers. This method applies to all finished leathers with a smooth surface.