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Description

The black corundum is made from the high quality alumina, iron oxide and other trace elements fused in the arc furnace, forming the black crystal.

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Advantage

• high toughness,
• high temperature resistance
• stable thermal property
• strong cutting ability
• durability
• high work efficiency.

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Parameter

• The color: black
• The shape: particle in trigonal shape
• Melt point:2050°C
• Mosh hardness: ≥9.0
• The max temperature:1850°C
• True density(g/cm3): ≥3.50
• Coefficient of linear expansion(0-1600°C): 7-9
• The main chemical composition: Al2O3,

Specification

specification

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Al2O3

Fe2O3

SiO2

TiO2

First class

85

6-9

5-8

2-4

Second class

<80

>9

>8

>4

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Usage

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