Vacuum Impregnation is a sealing treatment of porous castings with a medium by filling the pores with a thermosetting polyester resin under pressure to stop pressure leaks. The castings may have leaks, cracks, and voids that are created in the base material during the manufacturing or subsequent machining processes.
Impregnation is an important part of the workflow in modern electrical engineering. Its primary function is to solidify windings and protect them from moisture, dust, contamination and chemically aggressive substances. The impregnating medium can ensure that the heat that is generated in the conductor can be transferred to the environment and the laminated core more effectively.