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

900oC 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 Sizes

F12,F14,F16,F18,F20,F22,F24,F36,F40,F46,F54,F60,F70,F80,F90,F100,F120,F150,F180,F220, F230F240,F280,F320,F360,F400,F500,F600,F800,F1000,F1200

P24,P30,P36,P40,P50,P60,P70,P80,P90,P100,P120,P150,P180,P220,P240,P280,P320,P360,
P400,P500,P600,P800,P100,P1200

JIS240,JIS280,JIS320,JIS360,JIS400,JIS500,JIS600,JIS800,JIS1000,JIS1200,JIS1500,JIS2000,
JIS2500,JIS3000

Other sizes can be also available on request.


Application

Vitrified tools         

Lapping          

Resinoid tools         

Blasting          

Polishing             

Scrubing         

Tumbling              

Deburring       

Self-tumbling       

Non-slip          

Lapping compound

Wire saw         

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


Packing

25 kgs or 50 kgs packed into three layers bags, or can be packed on request.


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