What Is White Fused Alumina? Proprietăți, Grit Sizes and Uses

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What Is White Fused Alumina? Proprietăți, Grit Sizes and Uses

Henan Abrazivi Superiori

White Fused Alumina is a white man-made corundum that, like natural corundum gemstones, has high hardness, high temperature resistance, chemical stability and purity. Cu o duritate Mohs de 9, second only to diamond, a maximum use temperature close to 2000°C, and an Al2O3 content greater than 99%, these excellent material properties make White Fused Alumina more and more widely used in industrial production today.

Alumină albă topită is made from industrial alumina powder, which is smelted in an electric arc furnace at a temperature of over 2000°C and cooled and crystallized to obtain White Fused Alumina frit.

White Fused Alumina and industrial alumina powder also contain alumina, so why do we need to do this extra work for smelting?

This is because the many excellent characteristics of White Fused Alumina come from its α-Al2O3 crystals, while the alumina content of industrial alumina powder is only about 98%, which not only contains other impurities, but also contains Al2O3 isomers, which can significantly reduce the various properties of corundum materials. Prin urmare, it is necessary to remove impurities by melting, purify the alumina content, and form α-Al2O3 crystals by re-crystallization.

Main Properties

Proprietate	Practical Significance
High hardness	Supports grinding, blasting, lapping and wear-resistant applications.
Low iron content	Reduces the risk of iron contamination and dark discoloration.
Angular grain shape	Provides cutting edges for material removal and surface preparation.
Stabilitate termică	Supports selected refractory and high-temperature applications.
Chemical stability	Provides resistance in many industrial environments.
Wide grit range	Allows selection from coarse blasting grains to fine polishing powders.

Exact chemical composition, bulk density, magnetic content and particle size distribution vary by grade. Insert verified values from the current product specification rather than publishing generic numbers.

Classification of White Fused Alumina

The melting and cooling process results in several tons of corundum lumps, which cannot be used directly in industrial production, so they need to be processed and crushed into different sizes to suit various applications.

The classification of White Fused Alumina according to particle size mainly includes:

White Fused Alumina segmental sand (White Fused Alumina sand within two particle sizes).
White Fused Alumina particle size sand (corresponding to the standard requirements of the model).
White Fused Alumina fine powder (fine segmental sand that completely passes through a certain screen).
White Fused Alumina micro powder (superfine powder with a general particle size of less than 60 microns).

White Fused Alumina segment sand

White Fused Alumina segmental sand: it is White Fused Alumina product with particle size range of 0-1mm, 1-3mm, 3-5mm, 5-8mm, 100#-0, 200#-0, 320#-0, etc.. It is transported from the smelting workshop to the section sand production workshop with high quality White Fused Alumina boulders, crushed by the coarse breaker and then sieved to finally get White Fused Alumina products with particle size in a certain range. It is mainly used as shaped refractory material, unshaped refractory material and flooring sand.

White Fused Alumina fine powder

White Fused Alumina fine powder: It belongs to White Fused Alumina section sand, the product of 0 to a certain particle size in section sand is also called fine powder, it is the product that passes the finest sieve in White Fused Alumina section sand production line, the general models are: 100#-0, 200#-0, 320#-0, 0-1mm, it can be used as high quality refractory powder for shaped refractories and unshaped refractories. Also White Fused Alumina fine powder can be further ground, processed and sieved into White Fused Alumina number sand and White Fused Alumina micro powder.

White Fused Alumina particle size sand

White Fused Alumina particle size sand, also called White Fused Alumina number sand, is mainly divided into White Fused Alumina F sand and White Fused Alumina P sand and national standard micronized powder W number. It is a certain type of White Fused Alumina sand corresponding to the standard particle size distribution of F sand and P sand. Mainly contains

White Fused Alumina F sand: F4, F5, F6, F7, F8, F10, F12, F14, F16, F20, 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

White Fused Alumina P sand: p240, p280, p320, p360, p400, p500, p600, p800, p1000, p1200, p1500, p2000, p2500

White Fused Alumina micro powder

White Fused Alumina micronized powder is selected from high quality White Fused Alumina fine powder in White Fused Alumina section sand production line, further crushed and shaped by tube mill, magnetic separation to remove iron, acid washing and moisture. It is widely used in grinding and polishing of semiconductors, crystals, circuit boards, aluminiu, oţel, stainless steel, piatră, sticlă, etc.. as well as coatings, fillers, etc..

Size specification and composition

Japanese standard: 240#, 280#, 320#, 360#, 400#, 500#, 600#, 700#, 800#, 1000#, 1200#, 1500#, 2000#, 2500#, 3000#, 3500#, 4000#, 6000#, 8000#

European Standard: F240, F280, F320, F360, F400, F500, F600, F800, F1000, F1200, F1500

National standard: W63, W50, W40, W28, W20, W14, W10, W7, W5, W3.5

White Fused Alumina need to pay attention to the following points

Alumina content: Alumina content directly determines the nature of White Fused Alumina and the cost of the plant.

Sodium content: sodium oxide will produce high sodium aluminate in White Fused Alumina smelting, which affects the product quality.

Densitate în vrac: Bulk density can reflect particle density, particle shape and particle size composition to a certain extent.

Whiteness: the index of reflecting the appearance and color of White Fused Alumina.

Particle size distribution: too coarse or too fine particles will have different effects.

Forma particulelor: Different applications use sharp or rounded or flat particle shapes.

Applications in the white corundum industry

Polishing and Grinding
Materiale refractare
Sandblasting
Precision Casting
Abrazive acoperite
Curing Abrasives

White corundum life applications

White grinding wheel, gauze
White sharpening stone
Wear layer of laminate wood flooring
Sanding and polishing wax
Sapphire screen
Artificial corundum stones
Sandblasting of porcelain teeth

White Fused Alumina vs Other Abrasives

Feature	Alumină albă topită	Maro alumină topită	Carbură de siliciu
Primary composition	Aluminum oxide	Aluminum oxide with more impurities	Carbură de siliciu
General character	Hard, clean and relatively friable	Tough and economical	Very hard, sharp and relatively brittle
Iron contamination risk	Generally low	Higher than white fused alumina	Generally low, subject to grade
Common use	Slefuire de precizie, blasting, refractar	General grinding and blasting	Hard/brittle materials and rapid cutting
Selection factor	Clean finish and controlled cutting	Toughness and cost	Sharp cutting and material compatibility

Întrebări frecvente

Is white fused alumina the same as white corundum?

Da. White corundum and white aluminum oxide are common alternative names for white fused alumina.

Is white fused alumina harder than brown fused alumina?

Both are hard aluminum oxide abrasives. White fused alumina is generally cleaner and more friable, while brown fused alumina is often selected for toughness and economy. Performance depends on the grade and application.

Can white fused alumina be used on stainless steel?

It is often used where low iron contamination is important, including stainless steel processing. The blasting system and recycled media must also be protected from contamination.

Which grit size should I choose?

Coarse grits create faster removal and a rougher profile. Fine grits produce a smoother finish. The correct size depends on the workpiece, process pressure, equipment and target surface.

Can it be used in refractory materials?

Da. White fused alumina is used in selected refractory formulations, but chemistry, grain sizing and service conditions must be reviewed.