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RP - 621 Dielectric strength of a coating is the maximum electrical voltage that the coating material can withstand without experiencing electrical breakdown. It is an important property for insulating coatings used in electrical and electronic equipment, transformers, motors, cables, and protective surfaces. A coating with high dielectric strength effectively prevents the flow of electric current through it, thereby reducing the risk of short circuits, leakage currents, and electrical failures. Dielectric strength is usually expressed in kilovolts per millimeter (kV/mm). The value depends on factors such as coating thickness, material composition, temperature, humidity, and the presence of defects or impurities. Common insulating coatings include epoxy, polyurethane, silicone, and acrylic-based materials. During testing, a gradually increasing voltage is applied across the coating until breakdown occurs. High dielectric strength ensures reliable insulation, improves equipment safety, enhances durability, and extends service life, making it a critical parameter in the selection and evaluation of protective coatings.