Hardness(硬度) ≧7 Whiteness(白度) 94%GE DOP Absorption(DOP吸油量) 10~18 Bulking Value(容积密度) 0.6~0.4 g/cm3 Water Absorption(吸水量) 8~18 Free Moisture(水份) ≦0.3% Hollow Rate(中空率) 0 Loss on Ignition(煅烧减热) ≦0.5 Ignition Loss(烧失率) ≦0.5 Particle Size(平均粒径) 5.5 •4.5 • 3.5 µm Max Particle Size(较大颗粒) 28.0•23.0 •18.0 µm Particle Surface Area(比表面积) 20000~40000 PH (10% Solution)(酸碱度) 7.0±0.2