Description features: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 polishing and sand blasting. It can be also used to make superior refractory products.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 effectsNone
True Density(g/cm3)3.97
HardnessKnoop (kg/cm2)2000-2200
Mohs9.0
Color Dark Brown
Color after firing Light blue
Melting point 2000¡ãC
Max Usable temperature 1900¡ãC
Specific heat(cal/g.¡ãC) 0.26(20-29¡ãC)
Coefficient of thermal conductivity cal/cm2.sec.¡ãC)Room temperature 900¡ãC
0.047 0.013
Electrical resistivity (Wcm)30¡ãC300¡ãC900oC1600¡ãC
10161013105104
Coefficient of liner expansion (x10-6) 7-9(0-1600¡ãC)
Chemical Composition (% by weight) Grit
Item 10 90 100 180 220 - 240 280-400 500-1200
Al2O3 95.0 - 97.0 94.5 min 93.5 min 92.0 min 89.0 min
TiO2 2.0 - 3.0 2.0 - 3.0 2.5- 3.8 4.0 max 4.0 max
SiO2 1.2 max 1.2 max 1.2 max
Fe2O3 0.4 max 0.4 max 0.5 max Magnetic Matters Contents (% by weight) Grit No.Magnetic Matters Content
16#-3036#-60#70-120#150#-220#Available SizesF10-F220, F230-1200
P10-P220, P240-P1200
W63-W5,JIS240-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 compoundWire saw
Brown Fused Alumina Refractories (% by weight) Group Sizes of BFAMixed Sizes of BFA
Sizes
(mm)Chemical ContentSizes
(mm)Chemical Content
8-5
5-3
3-1
1-0Al2O3>95.0
SiO2Fe2O3TiO2CaOMgO10-0
5-0
3-0 Al2O3>95.0
SiO2Fe2O3TiO2Packing
BROWN FUSED ALUMINA Mo