High Voltage Silicone Rubber Extruded Fiberglass Sleeving has many uses and is recommended for the insulation of leads and connections in electrical and electronic components (transformers, coils, relays, solenoids etc.) where temperature extremes from -70° C through 200° C are encountered. It's made with a combination of silicone and rubber extruded onto a braided fiberglass sleeving. The silicone rubber coated sleeving is the only flexible insulating material appropriate for continuous service in ambient temperatures from -70° C through +200° C.