Interpretation of mill processability

In Region IV, the modulus is lower than in Region II the elasticity becomes low, giving a large permanent deformation. It is a fluid state, which is manifested as tackiness. In Region FV viscosity is the controlling factor. 

When the mill processability is in Region II, it is within the time-temperature window, which defines the rubbery state. The Region I is the border (transition) between the 

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