This is a common misconception: a higher concentration of release agent does not necessarily mean better anti-sticking performance. An excessively high concentration leads to several issues:
Over-concentrated release agents struggle to form thin, uniform films on the mold. They either drip/sag due to poor atomization or result in uneven film thickness. Thin areas may crack and fail, increasing sticking risk, while thicker areas dry slowly—entrapping molten metal during filling and causing new defects like porosity or cold shuts.
Higher concentrations mean a dramatic increase in organic content per unit area. This can discolor castings (e.g., blackening) and leave residue on mold surfaces. Accumulated residue impairs mold heat dissipation, affects casting dimensional accuracy, and necessitates frequent mold cleaning.
Water-based release agents rely on a uniform, ultra-thin lubricating film formed after water evaporation. Over-concentration delays evaporation, compromising film quality and undermining demolding efficiency.
Correct Approach: Follow the manufacturer’s recommended dilution ratio as a starting point. Fine-tune based on actual production conditions (e.g., casting complexity, mold temperature) to strike the optimal balance.
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