United States 


The EVF is a patent pending extensional viscosity fixture for measurements of the elongation viscosity of high viscosity materials, such as polymer melts, dough, adhesives, etc. The EVF can be used on ARES systems configured with the convection oven and provides best performance with FRT transducer. The fixture consists of a fixed and rotating drum, which winds up the sample at constant Hencky rate, while measuring the force generated in the sample. Since the torque measurement is decoupled from the motor, no bearing friction correction is required. The maximum Hencky strain with one rotation is four, and the maximum operating temperature is 350 °C.