Impregnation technology is an effective solution for casting leakage. By means of vacuum‑pressure treatment, impregnating liquid penetrates into internal defects such as porosity and blowholes of castings. After curing, micro‑pores are filled so as to eliminate leakage and achieve pressure‑resistant sealing performance. At present, the application scope of impregnation technology is expanding both at home and abroad. It has been recognized and adopted by military, automotive, shipbuilding and other major industrial sectors. Among them, vacuum‑pressure impregnation is generally acknowledged as the most efficient and most reliable impregnation method. It delivers remarkable technical and economic benefits for sealing assemblies as well as pre‑treatment processes prior to electroplating and painting of workpieces, including higher product qualification rate, energy conservation and cost reduction.

Impregnation equipment thoroughly solves sealing and leakage problems caused by cracks, micro‑pores and sand holes in metal castings and powder‑metallurgy parts. During the manufacturing of die‑castings and powder‑metallurgy components, quantities of micro‑pores, sand holes and cracks are inevitably formed due to crystal shrinkage. Micro‑pore leakage brings hidden risks to equipment operation. Even for non‑pressure‑bearing applications, cleaning agents and acid solutions may penetrate into parts during electroplating, painting and other surface treatments and trigger internal corrosion to shorten service life. Micro‑pores also cause bubbles and uneven surfaces during spraying and electroplating. With the continuous development of micro‑pore sealing technology, it becomes feasible to produce high‑quality finished castings and metallurgical products.