Impregnation Systems
Vacuum Pressure Impregnation (VPI) uses vacuum pressure to seal cavities in various materials such as in castings that need to be used in a leak-free application, smoothing surfaces for improved machinability, electrical windings of motors that require sealing from moisture, and infusing wood with resins to protect from exposure to the elements. The VPI process requires using a vacuum-tight chamber and pulling a vacuum to lower levels in order to remove both air and moisture from all the cavities that could trap gas or vapor.