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High Quality and Competitive Price
Exoprted to Japan and Europe

Brown FusedAlumina

Brown fused alumina is made from high qualitybauxite by fusing in an electric arc furnace at high temperature.It has good toughness and high hardness. It is suitable formanufacturing of vitrified and resin bonded tools, and for lapping,polishin, and sand blasting and sand cleaning. It can be also used to make superior refractoryproducts.

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 Moh’s 9.0 Color Dark Brown Color after firing Light blue Melting point 2000°C Max Usable temperature 1900°C Specific heat (cal/g.°C) 0.26(20-29°C) Coefficient of thermal conductivity(cal/cm2.sec.°C) Room temperature 900°C 0.047 0.013 Electrical resistivity (Wcm) 30°C 300°C 900oC 1600°C 1016 1013 105 104 Coefficient of liner expansion   (x10-6) 7-9(0-1600°C)

Chemical Composition (% by weight) Grit Item 10 –90 100 –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

MagneticMatters 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 grainsizes 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

Availablemircron 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 60.0±4.0       P240 58.5±2.0     280 52.0±3.0       P280 52.2±2.0 W63 63 - 50 320 46.0±2.5 F230/53 53±3.0 50.0±3.0 P320 46.2±1.5 W50 50 - 40 360 40.0±2.0 F240/45 44.5±2.0 42.0±2.0 P360 40.5±1.5     400 34.0±2.0       P400 35.0±1.5 W40 40 - 28 500 28.0±2.0 F280/37 36.5±1.5 34.5±1.5 P500 30.2±1.5     600 24.0±1.5 F320/29 29.2±1.5 27.7±1.5 P600 25.8±1.0 W28 38 - 20 700 21.0±1.3 F360/23 22.8±1.5 21.6±1.5 P800 21.8±1.0     800 18.0±1.0 F400/17 17.3±1.0 16.5±1.0 P1000 18.3±1.0 W20 20 - 14 1000 15.5±1.0 F500/13 12.8±1.0 12.3±1.0 P1200 15.3±1.0 W14 14 - 10 1200 13.0±1.0               1500 10.5±1.0 F600/9 9.3±1.0 9.0±1.0     W10 10 - 7 2000 8.5±0.7           W7 7 - 5 2500 7.0±0.7 F800/7 6.5±1.0 6.3±1.0     W5 5 - 3.5 3000 5.7±0.5 F1000/5 4.5±0.8 4.5±0.8             F1200/3 3.1±0.5 3.1±0.5     for general purposes for general purposes for bonded abrasives for coated abrasives

 

Application
Vitrifiedtools	Lapping
Resinoidtools	Blasting
Polishing	Scrubing
Tumbling	Deburring
Self-tumbling	Non-slip
Lapping compound	Wire saw