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