Vacuum impregnation is a valuable metal-finishing process that for some inexplicable reason suffers from near anonymity. The technology has been around since the late 1940s with wide-scale implementation in the early 1950s. It is a procedure utilizing vacuum and pressure to permanently seal porosity it practically all materials with an impregnant, commonly plastic resin. Casting porosity has always been problematic. It is caused mainly by gas cavitation, Foreign inclusions, oxide layers, and internal shrinkage.
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