The designation EP500 3 5 1.5 refers to a specific type of EP conveyor belt. "EP" stands for Polyester/Polyamide, indicating the materials used in the belt's construction. "500" represents the tensile strength of the belt, measured in Newtons per millimeter (N/mm) of belt width, meaning this belt has a tensile strength of 500 N/mm. The "3" indicates that the belt has three plies or layers of fabric. The numbers "5" and "1.5" refer to the thickness of the upper and lower cover layers in millimeters, respectively. Therefore, an EP500 3 5 1.5 conveyor belt has three fabric plies, with a 5mm thick top cover and a 1.5mm thick bottom cover, providing a balance of strength, flexibility, and protection against wear and tear.