White corundum powder is made from high quality alumina by melting above 2000°C in the electric arc furnace and then cooling. It is with high purity, great self-sharpening, acid and alkali resistance, high temperature and stable thermal performance. Its hardness is a little higher than brown fused alumina. It is with low toughness, great grinding ability, small heat and high efficiency.  

Physical properties		Chemical compositions	Value of specifications (%)
Hexagonal		Al2O3	≥99.53
Main crystal body	Al2O3
Color	white	Na2O	≤0.25
Grain density	≥3.9 g/cm3
Bulk density	1.75-1.95 g/cm3	SiO2	≤0.04
Morse hardness	≥9
Linear expansion coefficient(1/°C)	8.3x10-4	Fe2O3	≤0.04
Loss on ignition (%)	≤0.11

Suitable for various precision instrument parts polishing, ultra-precision machine tool spindle grinding and polishing crystal, super oil stone manufacturing, ball polishing, etc. Widely used in the polishing of electronics, optical instruments, glasses, bearing, quarts crystal, and advanced refractory material.