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Technical Data Sheet

INEX Composite Radiant Tubes

Material Properties


Bulk Density 2.85 g/cm³
Apparent Porosity 0 %
Flexural Strength 78 MPa
Compressive Strength 580 MPa
Modulus of Elasticity 155 GPa
 Vickers Hardness  SiC 25.000 MPa
Si  9.000 MPa
Thermal Expansion Coefficient
20°C -1000°C 
 4.2 x 10-6 /°C
 Thermal Conductivity @ 100°C
160 W/m°K
24 W/m°K
 Specific Heat  @ 25°C
600 J/kg°K
1200 J/kg°K
 Maximum Application Temperature  1340°C

Dark phase = SiC
Light phase = Free Si


  • 2450°F (1340°C) Maximum Tube Temperature
  • Conventional Metal Alloy Tube  < 60 BTU/hr·in2 (27 KW/m2
  • INEX Composite Tubes Heat Flux  > 200 BTU/hr·in2 (90 KW/m2) routinely achieved without concern for Creep or Thermal Shock
  • A unique dual-phase, metal matrix composite consisting of Silicon and Silicon Carbide, specifically formulated for high performance and low cost.
  • Patented manufacturing process enables production of composite radiant tubes at a price competitive with conventional metal alloy tubes
  • Reduction in furnace downtime, tube replacement, labor cost and cycle time - all of which contribute to lower operating expenses and the capability for higher temperature heat-treating.


Furnace productivity is improved by reducing recovery time in batch furnaces or higher mass rate in continuous furnaces. This is NOT possible with conventional alloy tubes because of their limited heat flux capabilities.
  • Conventional Metal Alloy Tube = Less than 60 BTU/hr·in2 (27 KW/m2)
  • INEX Composite Si-SiC Tube  =  Greater than 200 BTU/ hr·in2 (90 KW/m2) routinely achieved without concern for Creep or Thermal Shock