Lost Foam Casting is a near-net-shape forming process that uses expandable polystyrene (EPS) as the pattern material. Its core principle involves producing a foam pattern identical to the final part, coating the pattern with a high-temperature-resistant refractory coating, and embedding it in dry sand. During pouring, molten metal vaporizes the foam pattern and occupies its space, creating a metal casting that mirrors the original pattern. Since the pattern does not need to be removed and no parting line is required, the overall process is simpler in structure and significantly improves the efficiency of manufacturing complex components.

Lost Foam Casting is widely used in industries such as automotive manufacturing, agricultural machinery, pumps and valves, and construction equipment. It effectively reduces machining allowance, saves material, and lowers production costs. Additionally, the process offers strong repeatability and is environmentally friendly, making it advantageous for mass production of complex components with high dimensional consistency requirements. As the demand for lightweight and high-performance parts continues to grow, Lost Foam Casting is becoming increasingly important in modern casting technology.
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