White corundum for precision polishing of steel pipes

Introduce

INTRODUCE

White corundum for precision polishing of steel pipes belongs to electro-corundum. It is also be called white aluminum oxide, white corundum or white fused aluminum oxide. White fused alumina is obtained from the fusion of high purity calcined alumina in electric arc furnaces. Compared with brown fused alumina, white fused alumina is characterized with high alumina purity, high hardness, chemical stability, high melting point, and large crystal size. It is widely used in coated and bonded abrasives, polishing, precision casting, sandblasting and refractory raw materials.

Chemical Analysis

Al2O3	99.50%min
SiO2	0.02%max
Fe2O3	0.04%max
Na2O	0.30%max

Physical Properties:

Color	White
Crystal System	Trigonal system
Mohs Hardness	≥9
True Density	≥3.5
Grain shape	Block, with sharp edges
Specific gravity	Approx. 3,9 5 g/m³
Bulk density (Dependent on grain size)	Approx. 1.75-1.95 g/m³

Characters

White fused alundum /fused al2o3/WFA

High Alumina

White fused alundum /fused al2o3/WFA has a Aluminium Oixde(Al2O3) content of more than 99%. The high alumina content is ensured from its raw material which is calcined alumina.The high content of Al2O3 makes it perform well in fireproof and refractory applications.

Little Impurities

White fused alundum /fused al2o3/WFA has very little impurities, usually less than 0.4% Na2O, less than 0.15 SiO2 and less than 0.15 Fe2O3. It is chemically stable and little impurities make it ideal for refractory uses.

High Hardness

The high content of Al2O3 (Aluminum Oxide) makes it to be with very high hardness (Mosh Hardness≥9) and It’s usually utilized for grinding ,cutting, lapping, sandblasting, polishing, surface preparing and also for coated abrasive application, including sandpaper and sand belt.It’s not easy to break and good for abrasives. In abrasives industries, it is used for cutting wheels, grinding wheels etc, also used for coated abrasives applications like sandpapers. It’s white color and little impurities also make it excellent grinding and sandblasting media for preparing and polishing surface of metal, ceramic products etc. WA fines is also an good material for polishing and water jetting in electronics industry.

Sharp Edges

White fused alundum /fused al2o3/WFA is a crystal mineral with sharp edges and widely used in sandblasting,cutting and grinding abrasives.

Applications

•

oil stone

•Grinding, lapping and polishing medium
• Coated and bonded abrasives grain materials
• Precision casting
• Refractory raw materials
• Ware-resistance
• Road surface preparation

Available Grain Size

Micropowder/burnishing powder/polishing powder

Size

FEPA

F230 F240 F280 F320 F360 F400 F500 F600 F800 F1000 F1200 F1500 F2000

JIS

#240 #280 #320 #360 #400# #500 #600 #700 #800 #1000 #1200 #1500 #2000 #2500 #3000 #4000 #6000 #8000

JIS STANDARD