Black aluminium oxide is also known as low aluminum corundum. (AI2O3) content is 70% ~ 80%, containing more silicon oxide and titanium oxide impurities, It is also a new type product of polishing material, and it is a dark gray crystal body made αAl2O3 and ferropicotite as main ore in the electric arc furnace by smelting the bauxite.It has characteristics of moderate hardness, high toughness, high temperature resistance, and stable thermal stability. It is mainly suitable for free grinding, such as coarse grinding before electroplating products, mainly for polishing and sandblasting of stainless steel, fabricated metal products.

grit size :12#-220#;
Micropowder: 240#-1200#.

character
Aluminum oxide (AI2O3) content of 70% to 80%, containing more impurities such as silicon oxide and titanium oxide, a black corundum.Mainly used for stainless steel, metal products, optical glass, bamboo products, polishing and sand blasting, is manufacturing a resin grinding wheel, cutting discs, abrasive emery novel

specification	chemical%
	Al2O3	Fe2O3	SiO2	TiO2
A grade	85	6-9	5-8	2-4
B grade	<80	>9	>8	>4

Item	Indicators
Color	Black
Crystal	Trigonal system
Hardness (Mohs)	≥ 9.0
Melting point (°C)	2050
The maximum temperature (°C)	1850
True Density (g/cm3)	≥ 3. 50
Linear expansion coefficient (0-1600 °C)	7-9

1. the free grinding. plating metal parts such as the front underside polished aluminum.
2. bicycles. motorcycles. sewing machines. watches and components.
Polishing
3. lighting. plastic and metal tools. etc.. are also applicable to blasting (blasting. glass spray).
4. processing materials. manufacturing resin-cutting. angle grinding and coated abrasives. etc..
5. black corundum grain of sand and powder is particularly suitable for polishing stainless steel parts and Whetstone. grinding paste manufacturing.
6. black corundum of sand is the preferred material for the next slip road and coal pits warehousing.