Magmalox® Bricks

Melting Alumina Ceramic

Magmalox®  refers to a range of products manufactured by melting alumina ceramic power in an Electric Arc Furnace (EAF) at temperatures ranging from 2000-2500⁰C.  The molten product then casted in molds, and kept to anneal for almost two week. 

Saint Gobain Performance Ceramnics & Refractories, is the only company globally to have a range of 4 different grades of fused bricks, that offers that much flexibility in tackling customer needs and solves challenging situations for the hearth of reheating furnaces. Magmolox® preserves the quality of the rolled steel, homogenizes the temperature of the reheated products and avoid build-up and nodule formation and sources of rejects. It offers longest campaign without surface defects and roughness even worn hearth and optimize repair time. 

Electro-Fused Magmalox® Products:

  • Magmalox® RN
    Alumina-zirconia-silica fusion cast refractory
    Weak adherence of slag
    Easily cleaned, hot or cold
  • Magmalox® DR
    Alumina-zirconia-silica fusion cast refractory
    Homogeneous structure
    Avoid adherence of slag
    Resistance to thermal shock
    Easily cleaned, hot or cold
  • Magmalox® 550
    Alumina-zirconia-silica fusion cast refractory
    High wear resistance
    Avoid adherence of slag
    Easily cleaned, hot or cold
  • Magmalox® 555
    High alumina fusion cast refractory
    High wear resistance
    High temperature resistance
    Easily cleaned, hot or cold 

Material Properties

Typical Chemical Analysis (%)
  RN DR 550 555
Al203 73 73 73 95
SiO2 19 19 6 0.5
ZrO2 5.5 5.5 20.5  
Na2O 1.05 1.05 0.5 4.1
Fe2O3 0.7 0.7 <0.3 <1
CaO 0.5 0.5 <0.3 <1
TiO2 0.25 0.25 <0.3 <1
Typical Crystallographic Analysis (%)
  RN DR 550 555
Corundum 41 41 71 45
Mullite 39 39    
Zirconium Oxide 5 5 20  
B Alumina       53
Vitreous Phase 15 15 9 2
Typical Physical Properties
  Units Temperature RN DR 550 555
Density in Block Form g/cm3   3 2.9 3.55 3.17
Expansion % 1,150 °C 0.8 0.8 0.9 0.95
Thermal Conductivity W/m.K 1,250 °C 4.6 3.1 9.2 6.5
Hot Crushing Strength MPa 1,350 °C 45   120 156

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