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通过对高铬不锈钢用水玻璃铬铁矿砂以及在厚大铸钢上用呋喃树脂铬铁矿砂作造型材料产生“釉化”粘砂缺陷的分析，认为这是一类由铬铁矿砂在界面与高铬钢或铬铁矿砂与树脂碳化膜之间发生氧化还原反应，将铬铁矿砂中的铁还原出来，这种还原铁与砂粒形成致密混合物并紧密地附着在铸件表面而形成的“釉化”粘砂。
Through the analysis of the “glazed” sticky sand defects on the high chrome stainless steel water glass chromite sand and the large cast steel with furan resin chromite sand as the molding material, Oxidation-reduction reaction occurs between the interface and the high-chromium steel or chromite sand and the carbide film of the resin to reduce the iron in the chromite ore. The reduced iron forms a dense mixture with the sand particles and closely adheres to the surface of the casting The formation of “glazed” sticky sand.