Release agents are indispensable auxiliary materials in metal die casting production, primarily facilitating the removal of castings from molds while ensuring product integrity and post-processing suitability. During die casting, they perform three key functions: (1) Before molten metal injection, they uniformly coat the cavity surface to form a protective film, shielding the mold from direct erosion by molten metal; (2) During casting, they aid smooth metal flow into the cavity for optimal filling; (3) After solidification, they enable easy demolding of the part.
Die casting release agents have evolved significantly—from initial oil-based formulations to water-based ones, and now to emerging powder-based variants. Over this period, casting quality has improved, release agents have become more environmentally friendly, and their applications have expanded.
Water-based die casting release agents are projected to remain the dominant choice in the industry for market sales and production applications over the long term. Chinese die casting professionals should seize opportunities to develop high-performance release agents, prioritize practical process details, and comprehensively elevate the nation’s die casting capabilities.
Currently, water-based release agents are used in the overwhelming majority of die casting operations. They offer advantages such as excellent demolding performance, strong cooling capacity, pollution-free operation, smooth casting surfaces, fewer pores, and compatibility with automated processes.
When die casting plants encounter defective castings, they rarely analyze the issue from the rationality of release agent selection or the correctness of spraying processes. When switching to a new release agent, if it fails to align with traditional experience or operational habits, it is often immediately dismissed. This leads to a puzzling scenario: one plant handles a specific release agent with ease for the same casting type, while another complains about its poor performance. The root cause lies in insufficient understanding of release agent properties and neglect of critical details requiring special attention.
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