Insulating Firebricks

Six grades of insulating firebricks with limiting temperatures of use ranging from 1260°C to 1790°C. Each grade is formulated to meet specific thermal and physical requirements.
JM 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.

Classification Temperatures From
1260°C up to 1790°C
Maximum Continuous Use Temperature
The maximum continuous use temperature depends on the application.
Features
Low thermal conductivity
Gives good thermal insulation, enabling the use of thin-walled 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.
Purity
The very low iron and alkali flux content confers good refractoriness and the high alumina content contributes to their stability in reducing atmosphere.
High hot compressive strength
The accurate dimensions enable the bricks to be laid more quickly, with thin, uniform joints, allowing the construction of strong and stable structures.
Large bricks or slabs
They are available in sizes 230 x 610 x 64 or 76mm and 250 x 640 x 64mm. These can be machined into special shapes, incurring fewer sections and joints.
Purpose-designed packaging
Protects the bricks in transit (in cartons containing 4 to 25 item, depending on shape) and facilitates on-site handling.
Typical Applications
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, soaking pits, stress relieving furnaces, reactor chambers and similar high temperature industrial equipment.
Special Shapes
In addition to the standard brick sizes, JM insulating firebricks are available in pre-machined special shapes.
The blanks for very large shapes are formed by mortaring together two or more JM slabs, the unique large sizes of
these slabs ensuring the least number of sections and joints in the finished article.