Scotch Rubber Mastic Tapes 2228 Mastic tape consists of Ethylene Propylene Rubber (EPR) backing coated with a strong, temperature-stable mastic adhesive. The integrated suspension models also feature a wide face seal with soft elastic for improved comfort and reduced noise. Its temperature-rated at 194F (90C), and rated for emergency overload of 266F (130C). Use this tape to insulate, pad, and seal bus bar and splice connections. Compatible with solid dielectric cable insulation Pack of 1