Sleeving used on standard Solenoids to insulate the lead wires where they exit the Solenoid case is black Vinylite per Mil-I-631B, Type F, subform Ua, Grade C, Class 1, Category 1, and meets UL files E13565 and E-18459. Sleeving on high-temperature coils is Teflon for temperatures up to 200°C continuous, and will meet the requirements of AMS 3655 and UL files E-20344 and E-39513.