Die pressess the reinforced polypropylene into filtration plate & frame featuring high intensity, light weight, anticorrosion, poisonless and smellles; The hydraulic device is used for pressing and releasing the chamber plates. The electrical contact pressure guage is available to automatically maintain pressure and the maximum pressure is 25MPa; Maximum filtering pressure is 1.6MPa for box type filter, 0.5MPa for frame & plate type; Press the button on the electrical control board equipped with safe device to ensure safety to operators.