Mastic tape consists of Ethylene Propylene Rubber (EPR) backing coated with a strong, temperature-stable mastic adhesive Thick construction allows quick application build-up and padding over irregular connections Its temperature-rated at 194°F (90°C), and rated for emergency overload of 266°F (130°C) Use this tape to insulate, pad, and seal bus bar and splice connections Compatible with solid dielectric cable insulation Flexible over wide temperature range.