煤粉光亮碳可作为煤粉的技术性能指标。
Lustrous carbon is deemed as technical data for evaluation of coal-dust.
光亮碳高的煤粉用于型砂，可降低铸件表面粗糙度值。
The use of coal-dust with high lustrous carbon in molding sand can improve surface roughness of the castings.
其中R1和R2具有高的光亮碳生成率，R3可减小型砂的热膨胀。
R1 and R2 have high lustrous carbon productive ratio. R3 can relax the thermal expand in great extent.
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