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Calcined Alumina

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Description

Hongtai calcined aluminas are more pure than fused aluminum oxide products with the exception of fused white aluminum oxide. When milled, however, calcined aluminas retain the chemistry of the unmilled crude more closely than fused aluminum oxide. Precision-grade calcined alumina can be used in glass and metal lapping and polishing as well as on coated abrasive tapes.

The two characteristics of calcined alumina that distinguish it from fused aluminum oxide grains are shape and purity. Calcined alumina grains are normally composed of single platey crystals, whereas fused aluminum oxide grains tend to be fractions of large crystals and blocky in shape.

Calcined Alumina Features:

-High Hardness

-High Compression Strength

-Abrasion/ Wear-Resistance

-Abrasives

-Chemical Inertness

-High Degree of Refractoriness

-Superior Electrical Insulating Properties

-Dielectric Properties

-High Melting Point

Calcined Alumina Specifications

MN/Y MN/Y-407 DN-6 DN-440 DN-430 DN-420 DN-206
Al2O3 (%) ≈99.0 ≈99.0 ≈99.3 ≈99.3 ≈99.3 ≈99.3 ≈99.3
Na2O (%) 0.4 - 0.9 0.6 - 1.1 ≤0.5 ≤0.5 ≤0.5 ≤0.5 ≤0.5
Specific Surface Area (m2/g) 0.15 0.35 0.6 - 0.11 0.2 - 0.5 0.3 - 0.7 0.3 - 0.7 0.3 - 0.7 0.5 - 0.9
Particle Size Distribution d50 (µm) ≈70 7 - 10 ≈80 12 - 28 10 - 20 6 - 10 6 - 8
Particle Size Distribution d90 (µm) ≈120 15 - 30 ≈200 70 - 100 50 - 80 10 - 60 44489
Primary Crystal Size (µm) ≈15 ≈7 ≈6 ≈6 ≈6 ≈6 ≈6
Oil Absorption (ml/100g) ≈60 ≈18 ≈43 ≈30 ≈25 ≈20 ≈20
Cutting Effect 9 8 9 8 8 7 7
Polishing Effect 1 3 1 2 3 3 3

Calcined Alumina Applications

Calcined alumina is utilized in a variety of industrial applications including Structural ceramics, Technical ceramics, Polishing compounds for plastic, metal, and glass, Fillers for Rubber and Plastics, Friction - anti slip, Refractories, Paint & Coatings, and Thermal Spray Powders. -Structural Ceramics -Technical Ceramics -Body and Vehicle Armor -Lapping -Laminates -Coatings -Filtration -Abrasives -Refractory -Milling -Filler

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Customer Reviews

★★★★★ 5/5

I am very satisfied with its performance and quality. It is a durable and efficient abrasive that can grind and polish various materials.

Juan Carlos
★★★★★ 5/5

I have no experience with brown fused alumina. However, based on the web search results, I can say that brown fused alumina is a high-performance abrasive and refractory material.

Leo Kohen

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