Brown Fused Alumina
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Brown Fused Alumina
Brown fused alumina is made from high quality bauxite by fusing in an electric arc furnace at high temperature. It has good toughness and high hardness. It is suitable for manufacturing of vitrified and resin bonded tools, and for lapping,polishin, and sand blasting and sand cleaning.
It can be also used to make superior refractory products.
  Brown Fused Alumina
 
Chemical & Physical Properties
Crystal Form
Alpha alumina trigonal system
Chemical nature
Amphoteric
Reaction with acids
Subject to mild attack by aqua and/or hydrofluoric acid
Reaction with Alkalies
Very slight with strong hot solution only
Oxidation-reduction effects
None
True Density(g/cm3)
3.97
Hardness
Knoop(kg/cm2)
2000-2200
Mohs
9.0
Color
Dark Brown
Color after firing
Light blue
Melting point
2000C
Max Usable temperature
1900C
Specific heat(cal/g.C)
0.26(20-29C)
Coefficient of thermal conductivity
(cal/cm2.sec.
C)
Room temperature
900C
0.047
0.013
Electrical resistivity (Wcm)
30C 300C 900C 1600C
1016
1013
105
104
Coefficient of liner expansion     (x10-6)
7-9(0-1600C)
 
Chemical Composition (% by weight)
Grit Item
10 C 90
100 C 180
220 - 220
230-400
500-1200
Al2O3
94.5 - 97.0
93.5 min
92.5 min
91.0 min
89.0 min
TiO2
1.5 - 3.8
1.5 - 3.8
1.5 - 3.8
4.0 max
4.0 max
 
Magnetic Matters Contents (% by weight)
Grit No.
Magnetic Matters Content
16#-30
<0.0380
36#-60#
<0.0280
70-120#
<0.0230
150#-220#
<0.0170
 
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)
ISO(77)
Grit No.
Norminal size range(µm)
Grit No.
ds50 value (µm)
Grit No.
ds50 value (µm)
Grit No.
ds50 value (µm)
Standard werte der Mikro-F-Reihe
Sedigraph 5000D
240
60.04.0
P240
58.52.0
280
52.03.0
P280
52.22.0
W63
63 - 50
320
46.02.5
F230/53
533.0
50.03.0
P320
46.21.5
W50
50 - 40
360
40.02.0
F240/45
44.52.0
42.02.0
P360
40.51.5
400
34.02.0
P400
35.01.5
W40
40 - 28
500
28.02.0
F280/37
36.51.5
34.51.5
P500
30.21.5
600
24.01.5
F320/29
29.21.5
27.71.5
P600
25.81.0
W28
38 - 20
700
21.01.3
F360/23
22.81.5
21.61.5
P800
21.81.0
800
18.01.0
F400/17
17.31.0
16.51.0
P1000
18.31.0
W20
20 - 14
1000
15.51.0
F500/13
12.81.0
12.31.0
P1200
15.31.0
W14
14 - 10
1200
13.01.0
1500
10.51.0
F600/9
9.31.0
9.01.0
W10
10 - 7
2000
8.50.7
W7
7 - 5
2500
7.00.7
F800/7
6.51.0
6.31.0
W5
5 - 3.5
3000
5.70.5
F1000/5
4.50.8
4.50.8
F1200/3
3.10.5
3.10.5
for general purposes
for general purposes
for bonded abrasives
for coated abrasives
 
Brown Fused Alumina Refractories (% by weight)
Group Sizes of BFA
Mixed Sizes of BFA
Sizes
(mm)
Chemical Content
Sizes
(mm)
Chemical Content
8-5
5-3
3-1
1-0
Al2O3>94.50
SiO2<1.2
Fe2O3<0.2
TiO2<3.8
CaO<0.5
MgO<0.4
25-0
10-0
5-0
3-0
Al2O3>94.50
SiO2<1.2
Fe2O3<0.2
TiO2<3.8
 
Application
Vitrified tools         
Lapping          
Resinoid tools         
Blasting          
Polishing             
Scrubing         
Tumbling              
Deburring       
Self-tumbling       
Non-slip          
Lapping compound
Wire saw
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