Insulating Firebrick
General Information
Insulating firebricks are classified under temperature between 1300°C and 1700°C, manufactured from high purity alumina clay by mixing, press-forming, drying, sintering and machining. Bricks contain carefully-graded organic fillers which are burned out during sintering to give a uniform controllable pore structure.
Firebrick can be used as a hot face lining directly exposed to the heat or as a backup insulation layer in iron and steel mills, non ferrous foundries, petrochemical, ceramic, glass, cement and oil fired electric power generating plants.
Advantages
- Light weight and low thermal conductivity allows thinner furnace walls
- Maintain stable structural strength throughout ambient to maximum service temperature
- Low heat storage results in rapid cooling and heating operation
- Non standard sizes and shapes are available upon request
Applications
- Kilns
- Metal heat treatment furnaces
- Steel billet reheating furnaces
- Oil refinery heaters
- Laboratory furnaces
- Backup insulation for all furnaces
| INSULATING FIREBRICK DATASHEET |
NJM26 0.8 |
NJM26 1 |
NJM23 0.55 |
NJM28 0.9 |
NJM28 1 |
NJM28 1.2 |
NJM30 1 |
NJM30 1.2 |
NJM32 1.4 |
NJM32 1.5 |
|
|---|---|---|---|---|---|---|---|---|---|---|---|
| Classification Temperature <°C | 1430 | 1500 | 1226 | 1540 | 1580 | 1600 | 1650 | 1700 | 1750 | 1750 | |
| Continuous Working <°C | 1330 | 1400 | 1230 | 1440 | 1480 | 1500 | 1550 | 1600 | 1700 | 1700 | |
| Bulk Density(g/cm3)< | 0.8 | 1 | 0.55 | 0.9 | 1 | 1.2 | 1 | 1.2 | 1.4 | 1.5 | |
| C.C.R(mpa)> | 1.6 | 2 | 1.2 | 2.1 | 2.4 | 2.5 | 2.5 | 3.5 | 3.5 | 4.5 | |
| Modulus of Rapture (mpa)> | 0.8 | 1.0 | 0.7 | 0.9 | 1.0 | 1.2 | 1.2 | 1.5 | 1.7 | 2.0 | |
| Permanent linear change after 12 hour soaking at Temperature(%) | 1400 | 1470 | 1230 | 1510 | 1550 | 1570 | 1620 | 1670 | 1680 | 1680 | |
| Thermal Conductivity at 800C(W/m.k)< | 1.0 | 1.0 | 1.5 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | |
| Al2O3 > % | 0.35 | 0.42 | 0.22 | 0.36 | 0.4 | 0.45 | 0.44 | 0.52 | 0.56 | 0.58 | |
| Fe2O3 > % | 57 | 57 | 48 | 66 | 66 | 66 | 73 | 73 | 76 | 76 | |
| °C < | 1 | 1 | 1 | 1 | 1 | 1 | 0.5 | 0.5 | 0.5 | 0.5 |
