Sample cost is refundable or not?
Yes, Sample cost below 5 kgs can be refunded when bulk order confirmed,But freight cost for more than 1kg don’t be refunded.
Dense fused alumina for refractories 1-3mm 3-5mm 5-8mm
Dense alumina for refractories also called dense fused alumina for refractories, is a high-end refractory material made from the reduced fusion of high purity industry alumina powder and reducing agent in an electric arc furnace. Its main content is α-aluminum-oxide(α-Al2O3) and looks dark gray or light gray. The fused alumina through cooled down, crushed, and graded into grits/grains suitable for refractory applications. Its Al2O3 content is over 98%; the porosity rate is less than 4%. It is acid and alkali-resistant, slag-resistant, abrasion-resistant, anti-heat shock, and has stable chemical content. Dense fused alumina is widely used in the steelmaking industry, metallurgical, ceramic, glass, construction materials, shaped refractory and unshaped refractory; the available size is 0-1mm, 1-3mm, 3-5mm, 5-8mm.
Dense fused alumina is a high-grade refractory material with a main crystal phase of more than 98% and porosity of less than 4%; it has the advantages of good acid and alkali resistance, and good wear resistance under high temperature, corrosion resistance, and volume stability. It is widely used in metallurgical, petrochemical, building materials, ceramic, and other industries.
Application of dense fused alumina for refractories 1-3mm, 3-5mm, 5-8mm：
- Blast furnace runner castable
- Ladle castable
- Ramming materials, prefabricated parts, and other amorphous refractory materials
- Refractory brick, permeable transfer, nozzle seat brick, and other qualitative refractory materials
- Refractory materials for ceramics, cement, glass, and other industries
Physical properties of dense fused alumina for refractories 1-3mm, 3-5mm, 5-8mm：
| Item | Index |
| Color | Grayish-White |
| Crystal form | α-Al2O3 |
| Hardness (Mohs) | ≥9.0 |
| Melting Point (℃) | 2250 |
| Maximum Working Temperature（℃） | 1900 |
| True Density（g/cm3） | ≥3. 90 |
| Linear Thermal Expansion（0—1600℃） | 7—9 |
| Apparent Porosity (%) | ≤2 |
| Bulk density (g/cm3) | ≥3.9 |
Chemical compositions of dense fused alumina for refractories 1-3mm, 3-5mm, 5-8mm：
| Chemical Compositions | Refractories | Typical Value |
| Al2O (%) ≥ | 99.2 | 99.6 |
| SiO2 (%) ≤ | 0.5 | 0.4 |
| Fe2O3 (%) ≤ | 0.1 | 0.03 |
| TiO2 (%) ≤ | 0.1 | 0.05 |
| CaO (%) ≤ | 0.1 | 0.05 |
| MgO (%) ≤ | 0.1 | 0.05 |
| Na2O (%) ≤ | 0.1 | 0.05 |
| C (%) ≤ | 0.1 | 0.08 |
Dense Fused Alumina（FAQ）
What is your terms of delivery?
EXW, FOB, CFR, CIF, DDU.
Is brown aluminum oxide a possible substitute for high crystalline silica containing abrasive materials?
Yes. According to NIOSH, Brown Aluminum Oxide could be a viable substitute for consumers looking for safer alternative materials to high crystalline silica content abrasive products.
Which measurement methods are applied?
Dynamic image analysis (DIA) Static light scattering (SLS, also called laser diffraction) Screen analysis Impedance method Sedimentation
Why is corundum or silicon carbide used?
Corundum is the most frequently used abrasive. The purer the corundum, the harder it also is, which can be determined from the colour. The toughness can be increased by adding various metal oxides and by shortening the cooling process in production. The following distinctions are made: Brown fused alumina with
What grit do i use for my finishing application?
If you are roughing, choose a 36 to 80 grit. If you are intermediate grinding, use 80 through 180 grit. If you are finishing, use 220 through 240 grit.
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