Protect wires, cables, hoses and fuel lines against radiant and convective heat found in engine bays and around mechanical machinery. Taking two materials that provide high heat protection and joining them to create a high temperature heat shield. By using a two layer design, the outer aluminum foil layer redirect up to 90% of the radiant energy from hot steel slabs, molten metals, engine exhaust manifolds and open flames. The inner layer of fiberglass is designed for long term continuous operation temperatures of more than 400°C. Material: Outer Layer-Aluminum Foil; Inner Layer-Fiberglass Melting Point: 600+°C Working Temp: -50°C to +200°C RoHS Compliant All specs can very ±2%