What kind of aluminum oxide is used for Silicon Wafer Lapping

There are many kinds of aluminum oxide in the market,which are used in different fields.

For silicon wafer lapping,usually use platelet white calcined aluminum oxide,which is plate-shape and the specification is as follows:

AVERAGE CHEMICAL COMPOSITION(TYPICAL)             

Al₂O₃                                                 ＞99.0%

SiO₂                                                  ＜0.2%

Fe2O3                                              ＜0.1%

Na₂O                                                ＜1%

PHYSICAL PROPERTIES(TYPICAL)  

Mohs Hardness                             9.0

Specific Gravity                         ＞3.9g/cm³

Shape                                            Plate-shape

PARTICLE SIZE DISTRIBUTION