3M ThermaVolt AR Electrical Insulation Paper, 30 mil, is advanced insulation for electrical equipment. ThermaVolt AR paper is well suited for a wide range of electrical insulation applications, particularly low-voltage dry-type transformers. This single-ply paper is physically tough, resisting initial tearing with improved puncture resistance and mechanical strength. It has high dielectric resistance with excellent long-term resistance to corona. Its thermal stability offers excellent retained flexibility. UL Listed for UL 1446 systems up to 220 degrees C.