Delfingen NU-FLEX HT fiberglass sleeving is a Class C, thermal class 240 insulation made from heat-treated fiberglass for demanding high-temperature applications. It offers a temperature rating of -59°C to 648°C, dielectric grade C-3, and volume resistivity of 10^14 ohm-cm. Available in 12 AWG with an inside diameter of 0.086 inch and a 250 ft spool length, it is also supplied in multiple sizes from AWG 24 to 1 1/8 inch. Designed to meet NEMA TF-2 Type 3 standards, it delivers durable, flexible protection with excellent heat resistance and flame-retardant performance.