This is a standard test method for evaluating the adhesion strength of metallic coatings (such as tin or nickel layers) on the surface of copper conductors in wires and cables. Its core principle involves simulating the stresses that coatings may encounter during processing or use through specific physical or chemical methods, to assess whether the coating exhibits cracking, peeling, or detachment. This standard is typically used in conjunction with the general provisions section (GB/T 4909.1). Regarding specific testing instruments, major publicly available materials and standard summaries do not explicitly mention unified or specific instrument models. However, specialized mechanical devices for conducting winding, scratching, or friction tests are commonly involved.