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