HY4900 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 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. This instrument, which is designed to be an excellent system with high measuring precision, handling flexibility and testing reproducibility, has been widely applied in scientific research, quality control and process experiments. The whole system is as follows: