Fiberfrax® rope products are durable, high temperature, ceramic fiber packing materials that are well suited for industrial applications. They are noted for their superior insulating and sealing ability to 1260°C (2300°F). Fiberfrax ropes are twisted multi-ply ceramic fiber packing manufactured from Fiberfrax wicking. Standard minimum 3-ply rope is a low density, highly compressive product form. HD rope is up to 9-ply and provides increased compression resistance and strength and is approximately 40-65% denser than regular Fiberfrax rope.