Refractory Mullite Insulating Fire Brick GJM23

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20 m.t.
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100000 m.t./month

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CMAX insulating firebricks are classified under temperature between 1300 to 1700, manufactured from high purity alumina clay.

1. Lower content of iron, alkaline and impurities, good high temperature properties.
2. Homogeneous structure, light weight, energy saving because lower heat storage in the furnace during cooling cycles.
3. High strength, good thermal shock resistance under high temperature.
4. Precise sizes due to grinding and shaping after sintering, which meets the requirement of construction.
5. Max service temp: Up to 1730C (3160F)


Light weight and low thermal conductivity    
Low heat storage  
Low iron and impurities  
High thermal shock resistance


CMAX insulating firebricks can be used as a hot face lining directly exposed to the heat or as a backup insulation layer in iron and steel mills, non-ferrous foundries, petrochemical, ceramic, glass.







Classification Temperature, /      





Bulk Densityg/cm³  





Reheating Linear Change, %

 ≤0.9               (1550,12 h)

  ≤0.8                    (1510,12 h)

  ≤0.7                       (1410,12 h)

 ≤0.5                   (1230,12 h)

Al2O3 Content, %           





Fe2O3 Content, %             





Thermal Conductivity:      

 800, w/m.k   





 1000, w/m.k





 1200, w/m.k






Refractory Mullite Insulating Fire Brick GJM23

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Q:Can activated carbon be antiseptic?
In addition to activated carbon carbon, also contains two kinds of admixtures: one is the combination of chemical elements, mainly hydrogen and oxygen, these elements are due to incomplete carbonization and the residue in the carbon, or in the process of activation, non carbon and activated carbon surface chemical foreign combination, such as the use of water vapor when activated, the surface of the active carbon is oxidized or water vapor oxidation; another kind of admixture is ash, it is part of the inorganic carbon in ash; activated carbon is easy to cause two pollution.
Q:What is the exterior wall insulation material made of graphite?
Graphite polystyrene (SEPS) containing graphite particles special, can be like a mirror which contains thermal radiation, and can greatly enhance the heat insulation performance of the infrared absorption, thereby reducing the heat loss of housing. Its insulation capacity is at least 30% higher than the average EPS, helping to increase energy efficiency and reduce carbon dioxide emissions.
Q:There are several construction techniques for exterior wall insulation
Exterior wall internal insulation technologyThe interior heat preservation of the wall is to place the heat insulation material on the inside of the outer wall.Advantage:1) waterproof, weather resistance and other technical indicators of finishes and insulation material requirements are not very high, gypsum board, gypsum plaster mortar can meet the use requirement, convenient;2) the internal insulation material is separated by the floor slab and is only constructed within a high storey without scaffolding;3) in the hot summer and cold winter and hot summer and warm winter zone, the inner heat preservation can meet the requirement;4) for the energy transformation of existing buildings, especially at a time when the housing sold to individuals, the whole building (source: China insulation network) or the entire district unified reform is difficult, only by the possibility of a large number of internal insulation. Therefore, in recent years, the exterior wall insulation has also been widely used.Shortcoming:1) because of beam, slab, structural column will cause thermal bridges, more heat loss;2) due to the material, structure, construction and other reasons, the cracking of the facing layer;3) it is not convenient for users to decorate two times and hang ornaments;4) occupy indoor use space;5) the energy saving of the existing buildings is very disturbing to the daily life of the residents.6) wall under outdoor climate, the temperature difference between day and night and the large temperature difference between summer and winter, easy to cause the wall cracking.
Q:Advantages and disadvantages of wall insulation system?
Disadvantages: poor insulation effect (because it is not a full coverage of the insulation layer), there will be condensed water (because the wall is cold, the heat insulation layer is the temperature difference between inside and outside the formation of condensed water), the decoration (insulation layer in the internal decoration of the time on the wall decoration will destroy the insulation layer, comprising an area of effect) (rules of the construction area).
Q:Are there any differences between insulating bricks and refractory bricks
Heat preservation brick is to emphasize its heat preservation performance generally, not paying much attention to its refractoriness, but refractory brick is exactly the opposite. Different locations will use different materials, I hope we can choose carefully.
Q:What are insulation bricks for? Do not use high-rise buildings on the ah?
Heat preservation bricks are of course used for insulation... Tall buildings should not be used
Q:Refractory bricks, burner bricks, insulation bricks? Is it a kind of thing?
The burner brick is heavy brick, the use temperature is higher, the insulating brick is light brick, the use temperature is lower than the heavy brick.
Q:Insulation brick should pay attention to external walls?
Using special powder pointing pointing, check the horizontal joints and then hook the vertical slot, after cancelling the recessed brick outer surface 2mm, tile seam after hook silk or cotton cloth clean, after inspection of the large area pointing outside the walls, should be the implementation of a large area of local cleaning after cleaning, to ensure the whole project clean and beautiful.
Q:What's the price of lightweight refractory bricks?
In addition, general price comparisons are meaningless and need to be based on the use of demand = quality of products. After all, good quality is the driving force of continuous production.
Q:What is the bulk density of insulating bricks?
Stoneware porcelain water absorption rate is greater than 0.5% and less than or equal to 3%; fine stoneware bibulous rate is greater than 3% and less than or equal to 6%; brick bibulous rate is greater than 6% and less than or equal to 10%; pottery tile water absorption rate is greater than 10%. The water absorption rate of expression: ceramic brick brick >6% = >10% = >3% = fine stoneware porcelain stoneware or porcelain >0.5%

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