Most products will inevitably come into contact with or even rub against other objects in the environment during transportation or use. This interaction will inevitably lead to failure of some components of the device, such as fading, blurred patterns, and surface wear. . The wear resistance test of the product can provide information on the reliability of the product such as wear resistance. The manufacturer can use this information to improve the material or design of the product. Therefore, wear testing plays an important role in improving product reliability.

Interior or external materials, fasteners and The mechanical transmission components are usually coated with non-ferrous metal or phosphatized, anodized, etc. to achieve the protection or decoration of various materials or to increase the mechanical strength of components and enhance other functions in the chemical, electronic, electric power, metal and other industries, so that the concept of coating, plating, cladding, lamination or chemically formed film appears, which we all call "coating".