砂添加物对铸造厂减少铸件缺陷是极有用的，这已得到实。添加物可有效地减少金属渗透、毛刺、腐蚀、光泽碳和表面下气孔等缺陷。象黑红氧化铁、粘土糖类混合物及木屑这些材料可改善型砂成分而有助于减少这些缺陷的产生。添加物的选用如果在砂中加入1％～3％的氧化铁，就可降低 The addition of sand is extremely useful for foundries to reduce casting defects and this has been achieved. Additives can effectively reduce metal infiltration, burrs, corrosion, gloss carbon and subsurface porosity and other defects. Like black red iron oxide, clay sugar mixture and wood chips These materials can improve the sand composition and help to reduce the production of these defects. Addition of additives If the sand by adding 1% to 3% of iron oxide, can be reduced