Leakage is an external manifestation of internal through-defects in castings (e.g., porosity, shrinkage porosity, cold shuts). The role of release agents is to "stay out of the way" and "assist"—i.e., avoid becoming a gas source themselves while helping form a complete metal skin.
As previously noted, volatile components in release agents are a major source of casting porosity. If these pores form in sealed, thick sections of the casting, they directly cause leakage. Thus, strict selection of low-volatility release agents and precise spraying control are critical to cutting off this gas generation pathway at the source.
As noted in the document, "poor metal flow fusion leading to cold shuts" is a root cause of leakage. High-quality release agents ensure smooth metal flow filling, preventing premature cooling and oxidation of the flow front—promoting perfect fusion of metal streams and avoiding cold shut lines that could act as leakage channels. Additionally, uniform release agent application facilitates complete casting ejection, preventing surface micro-cracks (from sticking or galling) that may develop into leakage points under pressure.
Quality Control of Release Agents: Prioritize gas evolution as a key acceptance criterion for release agents.
Coordination Between Spraying and Venting: Ensure release agent spraying does not block or contaminate vent slots and overflow grooves. Adjust spraying programs to avoid these critical areas.
Full-Process Monitoring: Integrate release agent management into the quality management system. Regularly test its concentration, pH value, and contamination to maintain stable performance.
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