The glazing process in porcelain insulator production serves several purposes:
Improved insulation performance
The glazed surface is dense and smooth, reducing micropores and capillaries, preventing moisture and contamination from penetrating the porcelain body, and thus enhancing insulation strength.Better anti-pollution flashover performance
The smooth glazed surface is less likely to accumulate dust and dirt, and rainwater can easily wash it away, reducing the risk of flashover caused by surface contamination.Higher mechanical strength and longer service life
The glaze seals microcracks and pores formed during firing, increasing overall mechanical strength, slowing down weathering and chemical corrosion, and extending service life.Aesthetic and quality identification
The uniform surface color after glazing makes it easier to distinguish between manufacturers or voltage classes, and also facilitates quality inspection.Prevention of corona and partial discharge
The smooth surface of the glaze reduces electric field concentration, lowering the likelihood of partial discharge and corona.
In short, glazing provides more stable insulation, better anti-pollution performance, longer lifespan, and improved appearance.