Copper 180 sheet/plate, also known as Bronze 655 or Silicon Bronze, is a copper alloy containing 1-4% silicon and 1% manganese. It offers good corrosion resistance, formability, and the ability to maintain shape even after collisions, making it suitable for marine hardware, fasteners, bushings, shafts, and high-stress applications like studs and welding electrodes. While not as conductive as purer copper alloys, it can still be used for certain electrical components.