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Glazing

One of the reasons that parts are glazed is to make it easy to remove unwanted residue. For instance, spark plugs are glazed to reduce areas of potential arcing in high voltage environments. This process involves dipping, brushing or spraying a glass coating onto the surface of the fired ceramic. The glazed ceramic must then be fired to 1500 °F - 2700 °F to sinter the glazed coating.