The flat bark is banded on cool tight rolls (0.020 inch) and the zinc oxide and "{nevastain" B are added together. MIlling is continued for about ten minutes. The batch is removed from the mill, cut into small pieces, and dissolved in the toluene. The "Nebony" 100 and R-29 "Neville" Resin 10' are dissolved in the "Nevsolv T." The rubber solution and resin solution are then mixed together.