aluminum oxide grains for abrasive tools

1 AL2O3 content:95.70% 2 grit size:F8-F220 3 for bonded abrasive 4 passed ISO 9001:2000 5 best service

                                                                                             Brown fused alumina

1 Description

Brown Aluminium Oxide is fused in an electrical arc furnace at high temperature (approximately 2000 degrees Celsius) from a mixture of bauxite ,coal, iron scrap. Its appearance is brown colour.

It is characterized by great toughness, high mechanical resistance and high hardness (9 in Mohs scale). The micro hardness of the material reaches about 1900kG/mm2.

Specific gravity (density) equals 3.90+/-0.05cm3. Bulk density depending on size equals 1.52-1.87g/cm3. It has relatively high thermal conductivity and low thermal expansion.

It is the perfect material specifically manufactured to be used for general abrasive applications in bonded and coated abrasive tools, lapping and polishing industry. It is also used as a raw material in the manufacture of high alumina refractory.

 

2 Application

a. Bonded abrasive products.

b  coated abrasive products such as sand paper, sand cloth, roll, sand belt, flap wheel,etc..

c   Vitrified bonded grinding wheels and resin bonded grinding wheels.

d  Pressure blasting, surface finish, sandblasting

e  Various polishing application such as glass carving, rust removing, jean cloth grinding.

f  Wear-resistant and fire-proof products.

g  Friction products and abrasion resistance ground

h  Producing mold of precision casting

 

3 Grit Size Available (F series for bonded abrasive and sandblasting, P series for coated abrasive)

F series:   F4, F8, F10, F12, F14, F16, F22, F24, F30, F36, F40, F46, F54, F60, F70, F80, F90, F100, F120, F150, F180, F220, F230, F240, F280, F320, F360, F400, F500, F600, F800, F1000, F1200,F1500,F2000

P series:   P8, P10, P12, P16, P24, P30, P36, P40, P50, P60, P80, P100, P120, P150, P180, P220, P240, P280, P320, P360, P400, P500, P600, P800, P1000, P1200, P1500, P2000, P2500, P3000

 

4 Packing way selection

 a. In 25kg plastic woven bags

 b. In 1000kg big bag.

c. 40 x 25kg plastic woven bags in one big bag.

d. 40 x 25kg plastic woven bags on pallet

e. 40 x 25kg paper bags on pallet.

f. According to client’s special requirement

                                          Brown Fused Alumina AF-20B

 The grains of this kind of product crashed by ball mill machine, its grain shape is more blocky than rolling machine made grains, but its bulk density is less than BMK machine made grains. With the medium loose bulk density, and after wind blowing dust collection way, strong magnetism removing, very carefully sieve classifying, this kind of abrasive grain normally can match the various Bonded Abrasive Products applications

Typical Specification (F30)   Chemical Al2O3 Fe2O3 TiO2 SiO2 95.52% 0.08% 2.68% 0.92% Bulk Density 1.76g/cm3 Magnets 0.0076%

Physical Properties   Color Dark brown Shape Blocky, tough and sharp Crystal Form Alpha-alumina trigonal system True Specific Gravity 3.96 g/cm3 Hardness 2090 Knoop scale; 9.0 Mohs scale Melting Temperature About 2050 °C Magnetic Material 0.0076% Toughness 50.46 Hydrophilic 34.00

Grit Sizes (F)   8 12 14 16 20 22 24 30 36 40 46 54 60 70 80 90 100 120 150 180 220

Bulk Density Test Value (g/cm3)   Grit No F12 F14 F16 F20 F22 F24 F30 F36 F40 F46 B.D 1.94 1.91 1.90 1.87 1.84 1.84 1.81 1.79 1.75 1.75 Grit No F54 F60 F70 F80 F90 F100 F120 F150 F180 F220 B.D 1.72 1.72 1.69 1.65 1.61 1.61 1.59 1.57 1.56 1.52

Particle Size Distribution (PSD)   PSD According to ISO, ANSI, FEPA and JIS

aluminum oxide grains for abrasive tools