brown alundum is made of bauxite, anthracite coal, and smelted in electric-arc furnace of high temperature more than 2000 degrees. Abrasives tools made by brown fused alumina are suitable for metal with high tensile(like: steel, malleable iron, bronze etc). Suitable for product high consolidation abrasive, and suitable for grinding, polishing, blasting, precision casting etc. brown fused alumina is also used for refractory material. Brown fused alumina with characteristics like: high purity, good crystalline liquidity, low coefficient of linear expansion, corrosion resistance, high temperature, high strength.
一， Main Physical Properties
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COLOR
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BROWN,RED BROWN
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MOHS HARDNESS
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9.0
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BULK DENSITY
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1.75-1.95g/cm3
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SPECIFIC GRAVITY
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3.6-3.9g/cm3
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volume density
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3.6-3.9g/cm3
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melting point
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2250°C
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maximum service temperature
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1900°C
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二， Application
1. environmental blasting for aluminium profile/Copper material of glass/water to wash jeans
2. Grinding for kinescope/glass/monocrystalline silicon/lens/jadeware
3. Abrasion-proof material for expressway/airstrip/dock/parking lot/stadium
4. Bonded abrasives and Coated abrasives
5. Surface preparation and finishing
6.Thermal Spraying (Plasma Spraying)
7. Surface preparation and finishing
8.Super Refractories, Ceramics and Tiles
9. Lapping & Micro-blasting applications
三、Used for refractory,castable
1, Used for refractory,castable
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Properties
Type
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/sand 0-1，1-3， 3-5，5-8mm
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/Fines 0-100# 0-200# 0-320#
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Guarantee Value
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Typical Value
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Guarantee Value
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Typical Value
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Chemical
Composition
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Al2O3
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≥94.5
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96.1
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≥92
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94.1
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SiO2
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≤1.5
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1.16
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≤2
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1.56
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Fe2O3
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≤0.5
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0.13
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≤0.55
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0.28
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TiO2
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≤3
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1.78
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≤3.3
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2.25
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2,Used for abrasives,blasting,grinding
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properties
Type
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Grains
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|
8# 10# 12# 14# 16# 20# 22# 24# 30# 36# 40# 46# 54# 60#
70# 80# 90# 100# 120# 150# 180# 220#
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Guarantee Value
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Typical Value
|
|
Chemical
Composition
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Al2O3
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≥93
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95.65
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SiO2
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≤2.0
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1.04
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Fe2O3
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≤1.5
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0.14
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TiO2
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≤3.5
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2.2
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3， Used for abrasives ,lapping,Polishing
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properties
Type
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Micropowder
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“W”
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W63 W50 W40 W28 W20 W14 W10 W7 W5 W3.5
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“FEPA”
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F230 F240 F280 F320 F360 F400 F500
F600 F800 F1000 F1200 F1500
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“JIS”
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240# 280# 320# 360# 400# 500# 600# 700# 800# 1000#
1200# 1500# 2000# 2500# 3000#
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Guarantee Value
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Typical Value
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|
Chemical
Composition
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Al2O3
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≥92
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93.8
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SiO2
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≤2
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1.4
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Fe2O3
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≤2
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1.2
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TiO2
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≤4
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3.2
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