Techflex Insultherm Heavy Duty (HD) is constructed from braided fiberglass with a high temp cord braided in. The material is also saturated in acrylic resins. This design allows the sleeving to withstand 1,200°F, stay semi-rigid, and reduces fraying when cut. The addition of the High Temp Fiberglass cord significantly increases the products abrasion resistance while at the same time increasing the expansion rate maing long installations much easier. This product is perfect for extremely hot engine components in racecars, covering hoses in the welding industry or any application with extreme heat!