Insulating Fire Bricks Mullite insulating bricks characteristics and advantages: 1.Lower content of iron, alkaline and impurities, good high temperature properties. 2.Homogeneous structure , light weight , energy saving because lower heat storage in the furnace during cooling cycles. 3.High strength , good thermal shock resistance under high temperature. 4.Precise sizes due to grinding and shaping after firing ,which meets the requirement of construction. Index /brand | 23 | 26 | 28 | 30 | 32 | Classification temperature °C | 1260 | 1430 | 1540 | 1650 | 1760 | Bulk density kg/m3 | 580 | 800 | 890 | 1030 | 1250 | Modulus of rupture MPa | 0.9 | 1.5 | 1.6 | 1.7 | 2.0 | Cold crushing strength MPa | 1.2 | 2.4 | 2.6 | 2.8 | 3.4 | Permanent Liner Change % °CxHr | -0.1 | -0.5 | -0.8 | -0.9 | -0.9 | 1230X24 | 1400x24 | 1510x24 | 1620x24 | 1730x24 | Thermal expansion coefficient (1100°C)% | 0.45 | 0.50 | 0.55 | 0.60 | 0.65 | Thermal conductivity (W/m.k) | 400°C | 0.17 | 0.24 | 0.30 | 0.40 | 0.49 | 600°C | 0.19 | 0.27 | 0.32 | 0.42 | 0.50 | 800°C | 0.22 | 0.30 | 0.35 | 0.44 | 0.51 | 1000°C | 0.25 | 0.32 | 0.38 | 0.45 | 0.53 | 1200°C | | 0.35 | 0.39 | 0.47 | 0.55 | Al2O3 % | 45 | 50 | 64 | 72 | 76 | Fe2O3 % | 0.9 | 0.8 | 0.7 | 0.5 | 0.4 | SiO2 % | 50 | 43 | 33 | 26 | 0.4 | TiO2 % | 1.2 | 1.3 | 0.9 | 0.5 | 0.3 | CaO+ MgO % | 0.7 | 0.6 | 0.4 | 0.3 | 0.2 | K2O+ Na2O % | 1.3 | 1.1 | 0.8 | 0.2 | 0.1 |
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