# Presentation:
The **28-155 IS IFB** classical insulating brick for **1550°C** temperature applications. With high alumina content (>60%) and low iron oxide (<1.05%) it offers high insulation (0.40 W/m.K at 1200°C) and excellent mechanical properties (CCS >3 MPA).

🔥 **Classification temperature: 1550°C**.

♻️ **French refractory clays & local organic filler.**

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## Properties:

| Properties                                         | Standards   | Units | Average μ | Limits |
| -------------------------------------------------- | ----------- | ----- | --------- | ------ |
| **Classification**                                 | ISO 2245    |       | 150       |        |
|                                                    | ASTM C155   |       | 28        |        |
| **Bulk density**                                   | EN 1094-4   | g/cm³ | 0.94      | 1.05   |
| **Cold Crushing Strength** (// to extrusion)       | ISO 8895    | MPa   | 4         | 3      |
| **Permanent Linear Change** (12h at 1550°C)        | ISO 2477    | %     | -1        | -1.5   |
| **Chemical Analysis (XRF)**                        | ISO 12677   | %     |           |        |
| Al₂O₃                                              |             |       | 63        | 60     |
| SiO₂                                               |             |       | 34        |        |
| Fe₂O₃                                              |             |       | 0.8       | 1.05   |
| TiO₂                                               |             |       | 0.8       |        |
| CaO+MgO                                            |             |       | 1.2       |        |
| Na₂O+K₂O                                           |             |       | 1.2       | 1.5    |
| **Thermal Conductivity:**                          | ASTM C182   | W/m.K |           |        |
| (through 114mm dimension)                          | 200°C       |       | 0.35      |        |
|                                                    | 400°C       |       | 0.36      |        |
|                                                    | 600°C       |       | 0.37      |        |
|                                                    | 800°C       |       | 0.38      |        |
|                                                    | 1000°C      |       | 0.39      |        |
|                                                    | 1200°C      |       | 0.40      |        |
| **Reversible Thermal Expansion** (20°C to 1000°C)  | ISO 16835   | %     | 0.51      |        |
| **Refractoriness under load** (T₀.₅) 0.05 MPa Load | EN ISO 1893 | °C    | 1490      |        |
| **Compression Creep**                              | EN 993-9    | %/h   | 0.006     |        |
| **0.05 MPa Load, 0-25h at 1300°C Z₂₅**             |             | %     | 0.18      |        |
| **Pyroscopic Cone Equivalent**                     | ISO 528     | °C    | 1750      |        |

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## Dimensional Tolerances:

### **Standard Pieces**
- **Length**: ±1mm
- **Width**: ±1mm
- **Thickness**: ±1mm
- **Squaring**: 0.75mm / 100mm