1). Black fused alumina has good features as high hardness, strong tenacity, better bonding ability and hydrophilicity, giving less heat, good self-sharpening, smooth surface and high finish.

 

2). It's suitable for polishing various spare parts such as: Bicycles, sewing-machine, hard metal tools, medical apparatus, timepieces, glass products and stone grinding. It's also the right material for making abrasive tools: Fiber-reinforced cutting wheels, grinding wheels, sand cloth, paper and paste.

3). Specifications

 

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

4). Applications

 

- It is used for the bicycle, motorcycle, sewing machine, and clock parts.

 

- light ornament, plastic and hardware polishing, and also applicable to the sand blasting.

 

- It is the production materials: manufacturing resin-cutting slice, edges and corners grinding and coated abrasives.

 

- The black corundum particle and micro powder are suitable for stainless steel work piece polishing and abrading and making the whetstone and polishing paste.

 

- Black corundum sand is the preferred material of the slip-prevented road and coal pits warehousing.