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天然无定形石墨砂具有良好的导热性和蓄热性。在铸造生产中可以促进铸件的方向性凝固，防止粘砂、夹砂等铸造缺陷和改善铸件表面粗糙度。
Natural amorphous graphite sand has good thermal conductivity and thermal storage. In the casting production can promote the directional solidification of castings, prevent sticking sand, sand and other casting defects and improve the casting surface roughness.