“…Neither Mooney viscosity determinations nor parallel-plate plastometer determinations of GR-S indicate processing behavior, because two mixtures of the same viscosity may not be the same in smoothness and shrinkage after extrusion (84)• By determining the Mooney viscosity, V, and then the recovery, B, a function V/R can be calculated. A high R value or low V/R value indicates a low rate of decay in stress; hence, high shrinkage and roughness on calendering or extrusion scorch.…”