K2 Type: K2 Product Name : Hedgehog Type K2 Physical Characteristics 8x6 表格 Type A.B Demensions mm Std.Bulk Density (kg/m3) (%) Surface Area (m^2/m^3) VOID SPACE % (Pcs/m^3) Number 1.5" 40 134 295 86 20,600 2" 50 160 156 88 9,600 4" 100*50 62 122 91 2,800 ※Under conditions of “Random dumping”. for Plastic material.