Mullite Insulation Brick

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Mullite Insulation Brick

Firebird mullite insulating bricks are manufactured from high grade refractory powder and materials in good purity, shaped by casting or extrude or foaming methods, sintered at high temperature & enough holding time, grinding to dimensions & safety packed.

Low heat fusion

Direct flame contact

Good thermal shock stability

FJM 23,FJM 26,FJM 28,FJM 30

Low impurity content, excellent refractoriness

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Introduction

Features

Photo Gallery

Product Knowledge

Technology Parameters

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Introduction of Mullite Insulation Brick

Mullite insulation bricks not only provide excellent thermal insulation but also serve as a refractory material that can directly withstand high temperatures and exposure to flames. The FJM-23, FJM-26, FJM-28, and FJM-30 series of lightweight mullite insulating fire bricks feature low thermal conductivity, low heat fusion, and minimal impurities, offering high refractoriness and exceptional resistance to heat.

Mullite insulation bricks exhibit strong thermal shock stability and low thermal conductivity, making them highly effective in high-temperature shuttle kilns, ceramic roller kilns, and other industrial furnaces. The use of lightweight mullite insulation bricks helps companies significantly reduce energy consumption, lower production costs, and improve overall efficiency.

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Introduction of Mullite Insulation Brick

Features of Mullite Insulation Brick

High Temperature Resistance

Mullite insulation bricks, with a melting point of up to 1450°C, provide excellent high-temperature stability, maintaining their structure without deforming or melting under extreme heat.
Corrosion Resistance

These bricks offer strong resistance to both acid and alkali environments, ensuring long-lasting chemical stability even in harsh industrial conditions.
Wear Resistance

With a Mohs hardness of 9, mullite insulation bricks are highly resistant to wear and abrasion, reducing the need for frequent repairs and maintenance.
Thermal Shock Stability

Capable of withstanding rapid temperature fluctuations, these bricks resist cracking and spalling, ensuring reliable performance in extreme thermal environments.
Superior Insulation Performance

Thanks to their low density, mullite bricks provide excellent thermal insulation, effectively reducing heat loss and lowering energy consumption in high-temperature applications.

Photo Gallery of Mullite Insulation Brick

Production Process of Lightweight Mullite Insulation Bricks

The production of lightweight mullite insulation bricks involves several key steps, including raw material selection, crushing, mixing, forming, and firing.

Raw Material Selection: The primary raw material for lightweight mullite insulation bricks is mullite, with small amounts of alumina, calcium oxide, and other additives. The choice of raw materials directly impacts the brick’s performance and lifespan.
Crushing: The raw materials are crushed to achieve a uniform particle size, which is essential for consistent mixing and forming in later stages.
Mixing: The crushed raw materials are mixed together, with water and binding agents added to ensure proper bonding of all components, resulting in a uniform slurry.
Forming: The mixed slurry is shaped using methods such as pressing or casting, producing lightweight mullite insulation bricks in various shapes and sizes to meet specific requirements.
Firing: The shaped bricks are then fired at high temperatures, typically between 1400-1600°C, to stabilize their structure and enhance their refractory properties. The firing duration depends on the thickness and size of the product.

This process ensures that lightweight mullite insulation bricks meet the necessary standards for thermal insulation and durability in high-temperature applications.

Applications of Lightweight Mullite Insulation Bricks

Lightweight mullite insulation bricks are widely used in various high-temperature equipment across industries such as metallurgy, chemical, and construction materials. These bricks are commonly applied in steel ladles, iron ladles, glass kilns, cement rotary kilns, cracking furnaces, tubular heating furnaces, reformers in the chemical industry, hot blast stoves, ladle insulation linings, shuttle and tunnel kilns, ceramic roller kilns, and pusher plate kilns, serving as refractory insulation materials in industrial furnaces.

As a lining material, lightweight mullite insulation bricks effectively protect equipment from high temperatures, acid and alkali corrosion, and material abrasion, thereby extending the service life of the equipment and reducing production costs. Additionally, these bricks provide excellent thermal insulation, minimizing heat loss and lowering energy consumption.

The difference between different models of mullite insulation bricks

FJM23/FJM26/FJM28 in mullite insulation bricks represent different grades of brick numbers. Different grades of mullite insulation bricks will have different insulation performance, physical and chemical indicators and applicable scope.
① Different Al2O3 content The alumina content of mullite insulation bricks is 38-44%, 50-58% and 60-70% respectively. The higher the grade, the higher the alumina content, which affects the insulation performance and refractory temperature.
② Different refractory temperatures The refractory temperatures of the four grades of mullite bricks are 1260℃, 1430℃ and 1540℃ respectively. The higher the grade, the higher the refractory temperature. This is also the case with the increase of alumina content, the refractory temperature also increases, and the stability of mullite insulation bricks in high temperature environments is better.
③ Different volume density. The volume density of JM23 is 0.6g/cm3, while the volume density of JM26 and JM28 is the same at 0.8g/cm3;
④ Different compressive strength at room temperature. The compressive strength of mullite insulation bricks are 1.6Mpa, 2Mpa, and 3Mpa respectively. The higher the compressive strength at room temperature, the greater the load-bearing capacity and service life of the bricks.

Technology Parameters of Mullite Insulation Brick

FJM Series Insulating Firebrick
Grade		Standard	Unit	FJM23L	FJM23	FJM24	FJM25	FJM26	FJM26-60	FJM26H
Classification Group		ISO 2245		125-0.5-L	125-0.6-L	130-0.8	135-0.8-L	140-0.8-L	140-0.8-L	140-0.9
Classification Group		ASTM C155		23	23	24	25	26	26	26
Classification Temperature			℃	1260	1260	1300	1350	1430	1430	1430
Bulk Density		ASTM C134	g/cm³	0.5	0.6	0.8	0.8	0.8	0.8	0.9
Cold Crushing Strength		ASTM C133	MPa	1.2	1.6	2	2	2.5	2.4	2.8
Modulus of Rupture		ASTM C133	MPa	0.7	0.9	1.2	1.2	1.4	1.3	1.5
Permanent Linear				-0.3	-0.2	-0.5	-0.5	-0.4	-0.2	-0.2
Change Thermal	@ ℃×24h conductivity	ASTM C210	%	1230	1230	1300	1350	1400	1400	1400
400℃		ASTM C182	W/m.K	0.17	0.19	0.26	0.21	0.21	0.23	0.3
600℃				0.19	0.23	0.28	0.27	0.27	0.28	0.32
800℃				0.22	0.24	0.3	0.3	0.3	0.31	0.35
1000℃				0.24	0.25	0.34	0.32	0.32	0.33	0.38
1200℃				—	—	—	—	0.35	0.36	0.39
Chemical Composition
Al2O3			%	42	42	45	50	55	60	55
SiO2				54	54	48	46	41.5	37	41.5
Fe2O3				0.8	0.8	1	0.9	0.8	0.7	0.8
TiO2				1.2	1.2	1.2	1.3	1	0.7	1
Cao+MgO				0.7	0.7	0.7	0.7	0.7	0.5	0.7
Na2O+K2O				1.3	1.3	1.2	1.1	1	1.2	1

Grade	Standard	Unit	FJM27	FJM28	FJM30	FJM30S	FJM32	FJM32A
Classification Group	ISO 2245 ASTM C155		145-0.9-L 27	150-0.9- L	160-1.0-L 30	160-1.0-L 30	165-1.2-L 32	170-1.3-L 32
Classification Temperature	℃		1450	1540	1600	1600	1650	1760
Bulk Density	ASTM C134	g/cm3	0.9	0.9	1	1	1.2	1.3
Cold Crushing Strength	ASTM C133	MPa	3	2.8	3	4.5	4.5	4
Modulus of Rupture	ASTM C133	MPa	1.5	1.5	1.8	2	2.5	2
Permanent Linear Change @ ℃×24h	ASTM C210	%	-0.5 1450	-0.8 1510	-0.8 1600	-0.2 1600	-0.7 1650	-0.9 1730
Thermal Conductivity
400℃	ASTM C182	W/m.K	0.3	0.3	0.4	0.4	0.43	0.49
600℃			0.32	0.32	0.42	0.42	0.5	0.5
800℃			0.35	0.35	0.44	0.44	0.51	0.51
1000℃			0.38	0.38	0.45	0.45	0.53	0.53
1200℃			0.39	0.39	0.47	0.47	0.55	0.55
Chemical Composition
Al2O3		%	60.5	65	72	64	75	77
SiO2			36	32.3	25.7	33.5	23	21
Fe2O3			0.8	0.6	0.5	0.5	0.4	0.4
TiO2			0.7	0.7	0.7	0.7	0.6	0.6
Cao+MgO			0.5	0.5	0.3	0.3	0.3	0.3
Na2O+K2O			1.2	0.9	0.8	0.8	0.7	0.7

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