Imprex offers in-house Vacuum Pressure Impregnation (VPI) services as well as design, fabrication and installation of custom ... Vacuum Pressure Impregnation systems. Imprex has been designing, engineering, manufacturing, and installing Vacuum Pressure Impregnation (VPI) equipment since 1958. Our VPI systems are installed all over the world in applications from electronic equipment and coil windings to motors, generators, transformers, automotive parts, pumps, and more. Imprex pressure vessels are built to ASME Code. With a variety of VPI systems at our production facilities in Milwaukee, WI, we offer quick parts-processing turnaround with a dedicated system for rush orders. We offer high-quality service, testing, and documentation of impregnation. Our facility is ISO 9001:2008 certified for high quality and reliability. read more