ALUMINUM OXIDE STD-A25
Introduction
Product Benefits
STD-A25 portfolio offers a wide range of refractory agglomerated super-calcined (RASC) bauxite, which has been calcined at 1650 °C to a high-density aluminum oxide. The main constituent is the mineral corundum.
Quality assurance: Standardized quality guaranteed through ISO 9001 certified quality management.
Process control: Raw materials and production are closely monitored to ensure consistent chemical composition and grain size.
Applications: Used as a raw material for welding fluxes, in refractories, and in slip- and wear-resistant floorings.
Granulometric Data & Physical Characteristics
Mean values.These do not represent a specification.
| Property | Value (A25) | Unit | Method |
|---|---|---|---|
| +25 micron | 3.0 | % | Alpine air jet |
| D50 | 8.5 | μm | Laser diffraction |
| D97 | 30 | μm | Laser diffraction |
| Moisture | 0.1 | % | Halogen moisture analyser @ 105 °C |
| Oil absorption | 13 | g/100 g | ISO 787/5 |
| pH | 7.9 | / | ISO 787/9 |
| Density | 3.8 | g/cm³ | He-pyknometer |
| Loose apparent density | 0.3 | g/cm³ | ISO 787/11 |
Chemical Analysis (XRF)
Mean values.These do not represent a specification.
| Parameter | Result | Dimension | Method |
|---|---|---|---|
| Al₂O₃ | 88.8 | %(m/m) | XRF |
| SiO₂ | 6.0 | %(m/m) | XRF |
| Fe₂O₃ | 1.8 | %(m/m) | XRF |
| TiO | 3.4 | %(m/m) | XRF |
| Na₂O | 0.0 | %(m/m) | XRF |
| K₂O | 0.2 | %(m/m) | XRF |
| MgO | 0.0 | %(m/m) | XRF |
| CaO | 0.0 | %(m/m) | XRF |
| P₂O₅ | 0.07 | %(m/m) | XRF |
| LOI | 0 | %(m/m) | 1000 °C, 1 hour |
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