The "Neoprene" is added to cool, tight rolls and masticated for 20 minutes. The benzothiazyl disulfide and magnesium oxide are added together and dispersed. The "Thermoflex A" is added with both thermal blacks and mixed well. The stearic acid and zinc oxide are added last and together. The batch is then slabbed off and dissolved in toluene. The R-16 "Neville" resin and "X-1 Resinous Oil" are added under agitation to the rubber solution.