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White Fused Alumina
White fused alumina is made from high quality Bayer-processed alumina by fusing in an electric arc furnace at high temperature. It has high hardness and better cutting characteristics. It is suitable for manufacturing of vitrified and resinoid tools, and for lapping, polishing and blasting. It can be also used to make engineering ceramic and superior refractory products.
WA
 
Chemical & Physical Properties
Crystal Form
Alpha alumina trigonal system
Chemical nature
Amphoteric
Reaction with acids
Attck less than brown fused alumina
Reaction with Alkalies
Very slight with strong hot solution only
Oxidation-reduction effects
None
True Density (g/cm3)
3.96
Hardness
Knoop (kg/cm2)
2000-2200
Moh's
9.0
Color
White
Color after firing
White
Melting point
2000oC
Max usable temperature
1900oC
Specific heat (cal/g.oC )
20oC
100oC
0.183
0.217
Coefficient of thermal conductivity (cal/cm2.sec oC)
Room temperature
900oC
0.047
0.013
Electrical resistivity (Wcm)
30oC
300oC
900o C
1600oC
1016
1013
105
104
Coefficient of liner expansion (x10-6)
25oC-500oC
25oC-1000oC
25oC-1500oC
7.58
8.52
9.29
 
Chemical Composition
Grit
12# - 90#
100# - 220#
230# - 400#
500# - 1200#
Al2O3
98.5 min
98.5 min
98.0 min
97.0 min
Na2O
 0.5 max 0.7 max 0.8max 0.8max
 
Magnetic Material Content (% by weight) 
Grit
Magnetic Material Content
16#-24#
<0.0023
30#-120#
<0.0021
150#-240#
<0.0015
 
Available grain sizes
Grit No. Micron Grit No. Micron Grit No. Micron
10 2360 ~ 2000 30 710 ~ 600 80 212 ~ 180
12 2000 ~ 1700 36 600 ~ 500 90 180 ~ 150
14 1700 ~ 1400 40 500 ~ 425 100 150 ~ 125
16 1400 ~ 1180 46 425 ~ 355 120 125 ~ 106
20 1180 ~ 1000 54 355 ~ 300 150 106 ~ 75
22 1000 ~ 850 60 300 ~ 250 180 90 ~ 63
24 850 ~ 710 70 250 ~ 212 220 75 ~ 53
 
Available mircron powder sizes
China GB 2477-83
JIS
FEPA(84) / DIN(70)
Grit No.
Norminal size range(µm)
Grit No.
ds50 value (µm)
Grit No.
ds50 value (µm)
Standard werte der Mikro-F-Reihe
Sedigraph 5000D
¡¡
¡¡¡¡¡¡
240
60.0¡À4.0
¡¡
¡¡
¡¡
¡¡
¡¡¡¡
280
52.0¡À3.0
¡¡
¡¡
¡¡
W63
63 - 50
320
46.0¡À2.5
F230/53
53¡À3.0
50.0¡À3.0
W50
50 - 40
360
40.0¡À2.0
F240/45
44.5¡À2.0
42.0¡À2.0
¡¡
¡¡
400
34.0¡À2.0
¡¡
¡¡
¡¡
W40
40 - 28
500
28.0¡À2.0
F280/37
36.5¡À1.5
34.5¡À1.5
¡¡
¡¡
600
24.0¡À1.5
F320/29
29.2¡À1.5
27.7¡À1.5
W28
38 - 20
700
21.0¡À1.3
F360/23
22.8¡À1.5
21.6¡À1.5
¡¡
¡¡
800
18.0¡À1.0
F400/17
17.3¡À1.0
16.5¡À1.0
W20
20 - 14
1000
15.5¡À1.0
F500/13
12.8¡À1.0
12.3¡À1.0
W14
14 - 10
1200
13.0¡À1.0
¡¡
¡¡
¡¡
¡¡
¡¡
1500
10.5¡À1.0
F600/9
9.3¡À1.0
9.0¡À1.0
W10
10 - 7
2000
8.5¡À0.7
¡¡
¡¡
¡¡
W7
7 - 5
2500
7.0¡À0.7
F800/7
6.5¡À1.0
6.3¡À1.0
W5
5 - 3.5
3000
5.7¡À0.5
F1000/5
4.5¡À0.8
4.5¡À0.8
¡¡
¡¡
¡¡
¡¡
F1200/3
3.1¡À0.5
3.1¡À0.5
for general purposes
for general purposes
for bonded abrasives
 
White Fused Alumina Refractories (% by weight)
Group Sizes
Mixed Sizes
Sizes(mm)
Chemical content
Sizes(mm)
Chemical Content
30-10, 8-5
5-3, 3-1
4-2, 2-1
1-0.5
Al2O3> 98
SiO2<0.1
Na2O<0.5
CaO<0.1
50-0
10-0
25-0
5-0
Al2O3>98
SiO2<0.1
Na2O<0.5
CaO<0.1
 
Applications   
Vitrified tools         
Lapping          
Resinoid tools        
Blasting          
Coated tools          
Scrubing         
Engineering ceramic 
Deburring       
Investment casting     
Non-slip          
Polishing             
Refractory        
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