The density of Zirconox beads is 6.20gm/cc which is about 3 times greater than glass beads, 1.6 times than Zirconium Silicate beads and 1.1 times than MgO PSZ beads.
As Zirconox beads possess higher density than any other ceramic micro milling beads, they generate considerable heat in milling process, which may affect physical properties of ingredients being milled. Therefore, it is strongly recommended to provide suitable cooling system to the mill chamber, to monitor dissipation of heat generated during the milling process.
Due to higher density of Zirconox beads, it is strongly recommended for higher viscous formulations.
Ensure strainer aperture size is minimum 2 times smaller than the size of bead to avoid any passage of beads with slurry. To avoid fracture, shearing or flattened plate shaped beads, ensure the gap between walls and bottom of mill vessel to the stator/agitating arms is maintained minimum 3 to 5 times larger than the average bead size.
Premier bead mill, USA
Hockmeyer vertical bead mill, USA
Lehmann bead mill, Germany
Basket mill Netzsch, Germany
Getzmann bead mill, Germany
Type Of Mill
Closed Horizontal
Closed Vertical
Open Vertical
Bead Charge
65% - 75% of Net Volume
70% - 80% of Net Volume
60% - 70% of Net Volume
Packing Density Vs Fraction Size of Zirconox Micro Beads
Bead Fraction Size
Bead Packing Density
Dia. 0.4-0.6 mm
Dia. 0.4-0.7 mm
Dia. 0.6-0.8 mm
Dia. 0.8-1.0 mm
Dia. 0.7-1.2 mm
Ex: Bead mill net volume capacity is 50 ltr. charging with Dia.1.7-2.4 mm beads. For vertical closed type mill it works out to=35 ltr. (70% of mill vol) x 3.95 kg/ltr. (Packing density of Zirconox beads). That is 138 kg. Zirconox micro bead charge required for a 50 ltr. capacity closed vertical mill.
