The first national factory develops rolling method for balls diameter more than 400mm with quality of international level and changes the traditional thinking of no rolling method for large size.
Ā60±1mm          Ā50±1mm         Ā40±1mm

Chemical Compostion (%)
Al2O3	≥92%
SiO2	7% max.
Cao+MgO+Fe2O3+others:	2%
Bulk Density	>3.60g/cm3
Hardness (Mohs):	≥9
Water Absorption:	<0.01%
Self Wear Rate:	<0.012% (24h)
Color :	White

Producing Technique
Equipment
Rolling machine by centrifugal theory,water and materials automatic adding system,different diameter of machine for different size of alumina ball iwht flexible adjustment of angle and rotate speed.
Key process:

• Interval of adding water and materials time based on size of alumina ball
• Different angle of rolling machine based on different product
• Exact control of water
• Wet control