Projectile & Abrasive

Alumina (Brown Corundum)

Date:2018-7-12 10:35:32 Hits:3986

    Alumina sand (corundum sand) is one of the most economical abrasives for both dry and wet production processes. It is especially suitable for the treatment of rougher workpiece surfaces, while the treated surfaces require finer surfaces. This sharp, angular synthetic material is second only to diamond in hardness and is often used where iron contamination is critical. It can cut very hard materials or be spherical to process extremely precise workpieces to achieve extremely low roughness. Its high density, sharp, angular structure makes it the fastest cutting abrasive.  
    Brown corundum is made by fused high quality bauxite, while high quality aluminate is used to produce powdered corundum and white corundum. Their natural crystal structure makes them high in hardness and fast in cutting performance. At the same time they are often used as raw materials for bonded abrasives and coated abrasives.
     Corundum sand can be recycled in standard blasting equipment, the number of recycling is related to the material grade and the specific process.

  grade
16
24
36
40
60
80
120
  Surface roughness(um)
100
75
63
50
40
25
13
  Cleaning speed
very fast
  Damage speed
About 5-7 damage/cycle





Note: The above parameters are for comparison only.

Abrasive properties
shape
Angular, blocky
 
Typical chemical composition
 Hardness (Mohs standard)
  9
chemical components
White corundum
Brown corundum
Chrome corundum
 particle S.G.
 3.9-3.94
Alumina
>99.0%
>95.0%
>99.0%
 densitykg/cubic meter
 2400
Iron oxide
<0.1%
<0.3%
N/A
 colour
 Brown white pink
Titanium oxide
N/A
<3.0%
N/A
 Size standard
 FEPA/ANSI
Silica
<0.1%
<0.7%
<0.1%
 
Calcium Oxide
<0.1%
0.6%
<0.1%
 
Sodium oxide
N/A
0.35%
0.35%

Product Size

grade
8
10
12
14
16
20
24
30
36
40
Micron
2360
2000
1700
1400
1180
850
710
600
500
425
inch
(.001)
0.094
0.079
0.066
0.056
0.047
0.039
0.028
0.023
0.019
0.016
grade
46
60
80
100
120
150
180
220
240
320
Micron
355
250
180
150
125
88
74
62
53
30
inch
(.001)
0.014
0.010
0.007
0.005
0.004
0.0035
0.003
0.0025
0.002
0.0012

package      25kg/package
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