Thermo-Tec 17150 Silver 1-1/2' X 36' Thermo-Flex Wire-Hose Insulation: Automotive. Buy Thermo-Tec 17150 Silver 1-1/2" X 36" Thermo-Flex Wire-Hose Insulation: Heat Shields - ✓ FREE DELIVERY possible on eligible purchases. The combination of aluminum, silica and stainless steel is combined to produce a sleeving that is flexible, lightweight and strong 。 The aluminum-silica combination can be slit for applications such as wire looms or hose covering without disconnecting the ends of the wire or hoses 。 Thermo-Flex Aluminum can withstand extreme temperatures of up to 750 degrees Fahrenheit 。