理化性能分析 棕刚玉化学成份GB/T2478-1996 CHEMICAL COMPOSITION OF BROWN ALUMINIUM OXIDE 粒度范围 Range of Grit Sizes 化学成份%(按重量百分比) Chemical Composition%(by weight) Al2O3 TiO2 4#-90# 83 1.50-3.80 100#-320# ≥83 1.50-3.80 320#-0# ≥78.50 1.50-3.80