This revolutionary family of high purity fused silica products from Rex Materials is based on a unique technology and manufacturing process which permits the cost-effective production of shapes to meet most design and application requirements. FUSiO2N products and technology permit us to supply customers with a wide range of precision-made shapes small and intricate to extremely large shapes, and shapes with complex internal structures - which do not require costly additional machining. 

FUSiO2N shapes are fused silica (95%+) that are sintered to a high temperature. Today they are used in many non-ferrous applications, including by not limited to:

  • Thimbles
  • Control Pins And Spouts
  • Troughs And Launder Liners
  • Filter Bowls
  • Ladles And Pour Basins
  • Stopper Rods And Nozzles
  • Dams
  • Tap Blocks
  • Back Up Insulation 
  • Cements

Rex Materials ability to supply quality shapes cost-effectively enables you to use FUSiO2N parts in applications where ordinarily fused silica products have been too expensive.



  • Low Coefficient Of Thermal Expansion
  • Excellent Thermal Shock Resistance & Volume Stability
  • Low Thermal Conductivity
  • Excellent Thermal Insulator (Energy Savings)
  • Chemical Inertness (Except To Hydrofluoric Acid)
  • Resists Corrosion, Long Life
  • Reflects Infrared Radiation
  • Energy Saving
  • Low Dielectric Constant
  • Non-Conducting
  • Unique Cast Technology
  • Cost Effective Large And Complicated Shapes At Various Densities

Materials Available:        Technical Data

  • FUSiO2N SS: Standard PFS mix - 106 pcf (1700 kg/m³), 98% SiO2
  • FUSiO2N SL: Non-Wetting PFS mix 107 pcf (1715 kg/m³), 94% SiO2
  • FUSiO2N SP: Fine grained non-wetting mix - 110 pcf (1760 kg/m³), 95% SiO2
  • FUSiO2N Foam 50: An open cell pure fused silica foam which has excellent thermal insulation. Blocks available in sizes 12"x18"x4.5", 12"x18"x3", 12"x18"x2", 12"x18"x1". Special sizes and shapes upon request. 50 pcf (800 kg/m³), 98% SiO2
  • FUSiO2N CS Cement: A pure fused silica air setting cement. Used to bond both fused silica dense and foam shapes.
  • FUSiO2N CL Cement: A fused silica air setting cement that is non-wetting to aluminum. Used to bond both fused silica dense and foam shapes. 
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