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Brown fused alumina has three grades with 95%, 90%, 80-85% by Al2O3. The primary standard divides BFA into first grade, second grade, and third grade. The different chemical content is due to the crystallization and precipitation in the brown fused alumina smelting process. The middle part of electric arc furnace brown fused alumina is the best crystalline and high purity with 95% Al2O3. In the upper of the furnace, brown fused alumina is 90% content, and 80-85% brown fused alumina is in the bottom of the furnace. The price and usage are various due to the different chemical content.
Introduction of second grade brown fused alumina 80% 85%：
Brown fused alumina refractory is a dense material produced from bauxite raw material. The end product has a low iron content making it particularly valuable in refractory applications. Brown fused alumina is utilized within the refractory industry to manufacture high alumina unshaped or monolithic refractory products like bricks, castable, pre-cast shapes, and foundry applications, where the addition of brown fused alumina helps to obtain a smooth surface finish in investment castings.
Chemical compositions of second grade brown fused alumina 80% 85%：
| Item | Second grade | Third grade |
| Al2O3 | 80% – 90% | 70% – 80% |
| SiO2 | 1.5% – 4.0% | 2.0% – 5.0% |
| Fe2O3 | 6.0% – 10% | 8.0% – 15% |
| TiO2 | 2.0% – 4% | 3.0% – 5.0% |
| Bulk density | 1.45g/cm³ | 1.35g/cm³ |
| True density | 3.80g-3.9g/cm³ | 3.70g-3.80g/cm³ |
Physical properties of second grade brown fused alumina 80% 85%：
| Item | Index |
| Color | Dark Brown, Light brown |
| Crystal form | Trigonal crystal system, hexagonal crystal system |
| Hardness | 9 Mohs |
| Melting point | 2250℃ |
| Magnetic content | ≤0.05% |
| Linear expansion coefficient | 7-9（0 – 1600℃） |
Applications of second grade brown fused alumina 80% 85%：
Corundum is a mineral from the category of oxides and hydroxides and is the most frequently used industrial mineral worldwide. It also occurs naturally as a gemstone (sapphire, emerald, ruby). Chemically corundum is aluminium oxide with the chemical formula Al2O3.
Generally, it will take 30 to 60 days after receiving your advance payment. The specific delivery time depends .on the items and the quantity of your order.
The specific surface means the outer surface of a substance including all accessible pores in relation to the mass. It is determined using the Brunauer-Emmett-Teller (BET) method.
Yes, Sample cost below 5 kgs can be refunded when bulk order confirmed,But freight cost for more than 1kg don’t be refunded.
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