AT400 Torque Rheometer is a measuring system for studying the flow, plasticizing, heat and shear stability of polymers. This system consists of a platform and some function units, such as the mixer and single-screw or twin-screw extruder. The platform connected with a function unit can measure flow and compounding behaviors, critical processing parameters of temperature, pressure, torque and viscosity of polymers in the laboratory-requiring only small sample volume. Designed to an excellent system with high measuring precision, handling flexibility and testing reproducibility, this instrument has been widely applicable in science research, quality control and process experiment. The whole system is as follows: