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White Fused Alumina Micro Powder

White fused alumina micro powder is produced by melting and cooling high-quality alumina powder in an electric arc furnace at temperatures above 2000°C to form white fused alumina blocks. These blocks are then processed using crushing, magnetic separation, pickling, washing, and drying techniques. The final product mainly consists of α-Al2O3 crystals and maintains a low sodium oxide content, as low as 0.1% or lower, resulting in excellent insulation capabilities. The low sodium content increases the product’s melting point, particle density, bulk density, flexural strength, compressive strength, true density, and hardness. This product features a dense crystal structure, high density, good transparency, and excellent insulating properties.

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Physical properties

Hardness:

9 mohs

Crystal Form：

Alpha - Alumina

Melting point:

 2250°C

True Density：

 3.95g/cm3

Color：

White

Bulk density:

depending on grain size

Typical chemical analysis

Al2O3:

99.7%

Fe2O3:

0.03%

SiO2:

0.09%

Na2O：

0.08%
Available grain sizes
(Average grain size)

ds50 value (µm)

FEPA Nr.

Standard werte der Mikro-F-Reihe

JIS Nr.

 

FEPA Nr.

 

F230

53±3.0

#240

60±4.0

P240

58.5±2.0

F240

44.5±2.0

#280

52±3.0

P280

52.2±2.0

F280

36.5±1.5

#320

46±2.5

P320

46.2±1.5

F320

29.2±1.5

#360

40±2.0

P360

40.5±1.5

F360

22.8±1.5

#400

34±2.0

P400

35.0±1.5

F400

17.3±1.0

#500

28±2.0

P500

30.2±1.5

F500

12.8±1.0

#600

24±1.5

P600

25.8±1.0

F600

9.3±1.0

#700

21±1.3

P800

21.8±1.0

F800

6.5±1.0

#800

18±1.0

P1000

18.3±1.0

F1000

4.5±0.8

#1000

15.5±1.0

P1200

15.3±1.0

F1200

3.1±0.5

#1200

13.0±1.0

 

 

F1500

2.0±0.4

#1500

10.5±1.0

 

 

 

 

#2000

8.5±0.7

 

 

 

 

#2500

7.0±0.7

 

 

 

 

#3000

5.7±0.5

 

Application areas (including but not limited to)

  • Optical coatings, optical lenses

    White fused alumina micro powder is used for precise grinding and polishing in optical manufacturing to achieve high surface smoothness and precision for optical components.

  • Electronic packaging materials, ceramic insulating film materials

    In electronic packaging, white fused alumina micro powder acts as a sealing material for electronic tubes, offering excellent insulation and high temperature resistance. It is also employed in ceramic insulating film materials to enhance hardness, wear resistance, and improve the stability and durability of insulating films.

  • Biomedical ceramics

    White fused alumina micro powder is extensively applied in biomedical ceramics, including artificial joints, dental implants, and medical ceramic materials.

  • Composite materials, polymer reinforcement materials

    As a filler or reinforcement agent, white fused alumina micro powder enhances the strength, hardness, and wear resistance of composite materials.

  • Grinding and polishing

    White fused alumina micro powder is utilized for grinding and polishing processes, resulting in smooth and polished surfaces.

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