Lightweight Insulating Refractory

There are five kinds of lightweight insulating refractory products: clay, high alumina, mullite, alumina bubble ball, and light forsterite insulation refractory. They have low thermal conductivity and good thermal insulation properties, and can be used in metallurgy, construction materials, light industry and other thermal equipment, which has significant effect.

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 Fireclay & High Alumina Index / Product Unit Fireclay High Alumina
NG-0.6 NG-0.8 NG-1.0 NG-1.3 LG-0.6 LG-0.8 LG-1.0
Al2O3     ≧ % – – – – 48 48 48
Fe2O3    ≦ % – – – – 2.0 2.0 2.0
Bulk Density ≧ g/cm3 0.6 0.8 1.0 1.3 0.6 0.8 1.0
Cold Crushing Strength ≧ MPa 1.5 2.5 3.0 4.5 2.0 3.0 4.0
 Reheating Linear Change( test temp. ≦2%)           ≧ ℃ 1200 1250 1350 1350 1350 1400 1400
Thermal Conductivity( Average temp.350℃±25℃ ≦ w/m.k 0.25 0.35 0.5 0.6 0.3 0.35 0.5
Mullite, Alumina bubble brick & Light-weight forsterite brick Index / Product Unit Mullite Alumina Bubble Brick Light-weight Forsterite Brick
MG-0.6 MG-0.8 MG-0.9 MG-1.0 BG-1.2 BG-1.4 MZG-1.7
Classification temperature ℃ 1260 1430 1540 1600 1650 1650 1550
Al2O3   ≧ % 45 55 65 72 80 80 MgO65
Fe2O3   ≦ % 0.9 0.8 0.6 0.4 0.5 0.5 6
Bulk Density  ≧ g/cm3 0.6 0.8 0.9 1.0 1.25 1.45 1.7
Cold Crushing Strength  ≧ MPa 1.2 2.0 2.5 2.8 6 8 6
Reheating Linear Change _℃*24h % 0 -0.5 -0.7 -0.8 – – –
1230℃ 1400℃ 1500℃ 1600℃ – – –
1500℃*24h – – – – ±0.1 ±0.1 ±0.2
Thermal Conductivity 400 W/m.k 0.17 0.24 0.3 0.4 0.82 0.86 0.7
600 0.19 0.27 0.32 0.42 0.88 0.94 0.7
800 0.22 0.3 0.35 0.44 0.96 1.03 0.7
1000 0.24 0.32 0.38 0.46 1.06 1.12 0.8
1200 / 0.35 0.39 0.48 1.14 1.19 0.9