寶石砂特點
- 球形粒形：粒形接近正圓，表面光滑，無凹凸脈紋。其流動性和填充性良好，可獲得良好的成形性和鑄型強度。潰散性好，易清砂。比其他粒狀鑄造砂型使用較少的黏合劑。
- 熱膨脹率低：熱膨脹率低，與鉻礦砂等特殊砂相同，因此生產鑄件尺寸精度高，裂縫和表面缺陷少，鑄件成品率高。
- 抗破碎性佳：寶珠砂緻密性好，強度高，即使回收也很少破碎，減少了鑄造生產過程中粉塵對生產環境的污染，可回收性好，減少工業廢物排放，有利於環境保護。
- 耐火性佳：主要成分是氧化鋁，因此耐火性非常好。耐火度≥1850℃可適用於鑄造各種金屬及合金。
- 容重小：容重小，與鉻礦、鋯英砂（密度）相比，寶珠砂的密度較低，製作同型號（芯）時所用砂的重量遠低於鉻礦、鋯英砂、相應降低生產成本，以體積比，只需鉻礦50%，鋯英砂30%。
- 中性材質：PH值6-7，化學性質穩定，耐酸鹼侵蝕，酸耗值低。酸性和鹼性黏合劑均可使用。
與鉻鐵礦、鋯英石相比，其價格僅為鋯英砂、鉻鐵礦礦的25-50%。水玻璃添加量≤4%；並減少黏結劑引起的鑄造缺陷，提高鑄件的成品率
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