K-25 Insulating Firebrick 2.5" x 4.5" x 9"

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K-25 Insulating Firebrick 2.5" x 4.5" x 9"

K-25 Insulating Firebrick

9" x 4.5" x 2.5"


  • · Extremely low thermal conductivity
  • · Low densities
  • · Low heat storage
  • · Good strength at room and high temperatures
  • · Excellent resistance to alkali attack


  • · Backup insulation for carbon baking furnaces
  • · Backup insulation in aluminum electrolytic cells
  • · Electrical kilns for industrial and hobby use
  • · Backup insulation for blast furnace stove linings
  • · Linings for carbonizing furnaces
  • · Forge furnace linings
  • · Heat transfer linings

K-25 is a 2500°F (1371 °C) rated IFB

  • · Low shrinkage at use limit
  • · Excellent insulation stability


Thermal Ceramics was first to introduce insulating firebrick
(IFB) to the industry in the 1930·s. The K-IFB are
manufactured with a unique slurry casting process which
creates a network of microporosity that produces low thermal
conductivity and good thermal shock characteristics. This
process produces brick that are some of the most efficient
insulators available in the market. The high temperature firing
and resultant anorthite mineralogy (CaO • AI203 • 2 Si02) of
these low temperature K-IFB gives them excellent strength
atoperating temperatures and resistance to corrosive alkali

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