Most people believe that applying more die-casting release agent offers the biggest benefit of preventing mold sticking and stabilizing casting production—but this is not the case. Over-application actually increases the risk of mold sticking, shortens mold life, and degrades casting quality.
Generally, over-application is only justified in exceptional scenarios: extremely high mold temperatures, no cooling water, or thick workpieces. In these cases, extra release agent helps reduce mold temperature, improve adhesion, and minimize contact reactions between molten metal and the mold. Under normal conditions, however, over-application is strongly discouraged.
Die-casting release agents function by forming a protective film on the mold. Continuous spraying washes away the newly formed film—without a stable film, subsequent sprays create a weak, unreliable layer that increasesmold sticking. Additionally, the washed-off agent accumulates in other areas, leading to carbon buildup. Frequent thermal shock from repeated spraying also causes mold cracking, resulting in rough casting surfaces or even deformation in severe cases.
If combined with high release agent concentration, the mold surface turns yellow, making subsequent cleaning extremely difficult. If the release agent has weak corrosion resistance, rapid molecular motion in the mold accelerates rusting.
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