95%通過率廠家直銷涂料塗模劑原料325#白剛玉細粉 白剛玉是以鋁氧化粉為原料，經(jīng)電熔提煉結晶而成， 純度高、自銳性好、耐酸堿腐蝕、耐高溫、磨削能力強、發(fā)熱量小、效率高、,熱態(tài)性能穩(wěn)定它硬度略高于棕剛玉，韌性稍低。用其制成磨具，適用于磨削高碳鋼、高速鋼及不銹鋼等細粒度磨料還可以用于鑄造和耐火材料。 White fused alumina was made from the high quality alumina by melting above 2000 in the electric arc furnace and cooling. It is white with the main crystal phase alpha-Al2O3.The white alumina produced in titling electric arc furnace has the advantage of high bulk density and low porosity and the volume stability and thermal shock resistance can be improved. 主要物理特性Main Physical Properties 莫氏硬度 MOHS HARDNESS                  9.0 堆積密度 BULK DENSITY              1.75-1.95g/cm3 比重 SPECIFIC GRAVITY 3.95g/cm3 體積密度 3.60 用于耐火材料，搗雜料，爐料，涂料等Used for refractory, castable 屬性    Properties        規(guī)格Type       0-1 1-3 3-5mm  0-100  0-200   0-320 保證值 Guarantee  Value 典型值 Typical Value 保證值 Guarantee Value 典型值 Typical Value 化學成分 Chemical Composition Al2O3   ≥99.2  99.5  ≥99  99.2 SiO2   ≤0.1  0.06  ≤0.30  0.08 Fe2O3   ≤0.1  0.04  ≤0.20  0.10 Na2O   ≤0.4  0.30  ≤0.40  0.35