White Fused Alumina

White Fused Alumina (WFA) is a high purity synthetic mineral made from aluminum oxide. It is produced by melting a mixture of calcined alumina and a small amount of chromium oxide in an electric arc furnace at high temperatures. WFA has a very high degree of purity, with low levels of iron, sodium, and other impurities.

WFA is widely used in abrasive applications due to its hardness and toughness. It is commonly used in grinding wheels, sandpaper, and other abrasive products. WFA is also used in refractory materials, ceramics, and as a raw material for the production of aluminum metal.

WFA is available in different grit sizes and can be used for a variety of applications depending on the desired surface finish and material removal rate. It is often preferred over brown fused alumina (BFA) due to its higher purity and toughness.

White Fused Alumina
White Fused Alumina 19
  • Al2O3: ≥99.2%
  • SiO₂: ≤0.1%
  • Fe₂O₃: ≤0.1%
  • Na2O: ≤0.1%

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Particle Size

Particle Size
  • Common particle size of refractory materials: 0-1, 1-3, 3-5, 5-8mm, 100, 200, 325#
  • Common particle size of abrasives: 12, 14, 16, 24, 30, 36, 46, 60, 80, 100, 120, 150, 180, 200, 220, 240, 280, 325#.
  • Common micropowder for polishing and grinding: 400, 600, 800, 1000, 1500, 2000-6000#
  • The granularity of the product can be processed according to the granularity required by the user.


  • Hardness: One of the key properties of White Fused Alumina is its high hardness, which ranks at 9 on the Mohs scale. This makes it an excellent abrasive material, capable of efficiently cutting and grinding various surfaces.
  • High Refractoriness: White Fused Alumina has a high refractoriness, meaning it can withstand high temperatures without melting or breaking down. This property makes it suitable for use in refractory materials and high-temperature applications.
  • Chemical Stability: The chemical stability of White Fused Alumina is another important property. It is resistant to most chemical reactions and does not react with acids or alkalis, making it a versatile material for various applications.
  • Thermal Conductivity: White Fused Alumina has a low thermal conductivity, which means it does not conduct heat very effectively. This property makes it an excellent insulator, particularly in high-temperature environments.



  • Bonded Abrasives
  • White Fused Alumina is widely used in bonded abrasives, such as grinding wheels and cutting discs. Its hardness and durability make it an ideal choice for cutting and grinding various materials, including metals, ceramics, and glass.
  • Coated Abrasives
  • Coated abrasives, like sandpaper and abrasive belts, also use White Fused Alumina as the abrasive material. It offers excellent cutting performance and a long service life, making it a preferred choice for many industries.

Refractory Materials

Due to its high refractoriness and low thermal conductivity, White Fused Alumina is an essential component in the production of refractory materials. These materials are used to line furnaces, kilns, and other high-temperature equipment to provide insulation and protection against heat.

Surface Treatments

White Fused Alumina is also used in surface treatment processes, such as sandblasting and shot peening. It effectively removes surface contaminants and roughens the surface to improve adhesion for coatings or paint.

Precision Casting

In the precision casting industry, White Fused Alumina is used as a mold material due to its high refractoriness and excellent chemical stability. It can withstand the high temperatures associated with the casting process and produce high-quality castings with minimal defects.


Physical Properties

Hardness9 mohs
Grain shapeangular
Melting point2050℃
Specific gravity3.9-4.1 g/cm³
Bulk Density (depending on granular size)1.4-2.1 g/cm³

Chemical Contents

ltemAssurance ValueTypical Value
Al2O399.3% min99.7%
Fe2030.1% max0.05%
Na200.4% max0.16%
SiO20.15% max0.02%


20 Ton

Silicon carbide abrasives are harder and sharper than aluminum oxide abrasives, making them more aggressive and faster cutting. However, they are also more brittle, which can lead to faster breakdown and shorter abrasive life.

Grit sizes for silicon carbide abrasives range from coarse (24 grit) to ultrafine (1200 grit) and are used for different applications, from rapid material removal to precision polishing.

To choose the right silicon carbide abrasive, consider factors like the material being worked on, the desired finish, the abrasive life, and the equipment being used. Generally, harder materials require finer grits, while softer materials can be worked with coarser grits.

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