Fiber-reinforced plastic FRP is a durable, light-weight building material recognised for its corrosion resistance. FRP, which is simply a spirally twisted structural reinforcing rod, is commonly referred to as composite since it is composed of a variety of materials, including plastic resin and glass fibres. In contrast to iron and steel, which are prone to corrosion, the combination of these two materials yields FRP, or fiber-reinforced plastic, which never reacts to the chloride-rich atmosphere