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This 28 Grade insulating fire brick can withstand temperatures up to 1500°C and measures 9" x 4½" x 3". This grade of brick could be used in high wear and tear areas of the kiln, such as a fire box instead of a Heavy brick enabling you to keep the level of insulation the kiln has to offer at a higher level.
This grade is produced to meet specific thermal and physical requirements. These firebricks are made from high-purity refractory clays, with graduated additions of alumina for the higher temperature products. and a carefully graded organic filler, which burns out during manufacture to give a uniform, controlled pore structure.
Each brick is machined to precise tolerances on all six faces.
Low thermal conductivity - Gives good thermal insulation, enabling the use of thinwalled constructions.
Low heat storage - Due to their light weight and low thermal conductivity, JM bricks absorb minimal heat, giving significant energy savings in cyclically-operated kilns.
The accurate dimensions - Enable the bricks to be laid more quickly, with thin, uniform joints, allowing the construction of strong and stable structures.
Recommended for use as a primary hot face refractory lining or as back-up insulation behind other refractories in furnaces, kilns, flues, refining vessels and heaters, regenerators, gas producers and main