Designed tough for both indoor and outdoor use, Scotch® Rubber Mastic Electrical Tape offers excellent resistance to moisture and ultraviolet exposure for durability. This insulating tape features a self fusing mastic adhesive and can be used on copper or aluminum conductors rated at 194°F, with an emergency overload rating of 266°F. This tape is made thick for quick application build up and is conformable so it applies easily to irregular surfaces. Indoor or out, underground or exposed, Scotch® Rubber Mastic Electrical Tape delivers durable insulation for many of your electrical needs.