Mullite Insulation Brick

Mullite insulation brick has good thermal insulation effects. Kerui Refractory is an ISO certified manufacturer. With customized thermal design and 1600°C service capabilities, we have won the trust of more than 1,000 industrial partners in more than 50 countries around the world. Our product quality has also passed strict third-party certification.

Free Sample:
Available

Document:
Certificates Supporting

Performance Test:
Support

Shipment:
7-35 working days

Made in China

Leave Message Send Email

Specification Data of Kerui Mullite Bricks

Kerui Refractory offers four grades of mullite insulation bricks, including JM-23 (KR-23), JM-26 (KR-26), JM-28 (KR-28), and JM-30 (KR-30).

In addition, kerui refractory also provides B and C series insulation bricks. Please contact us for more details.

KR/JM23 Mullite Brick

Item/Grade	KR-23
Type	A	B	C	D
Al₂O₃, %	≥42	≥42	≥45	≥48
Fe₂O₃, %	≤1.2	≤1.2	≤1.0	≤1.0
Bulk Density, g/cm³	0.55	0.6	0.8	1.00
Reheating Linear Change, %	≤-0.5	≤-0.55	≤-0.4	≤-0.3
Temperature*12h	1230℃	1260℃	1300℃	1300℃
Cold Crushing Strength, MPa	≥1.2	≥1.5	≥2.3	≥3
Thermal Conductivity 350℃, W/(m·K)	0.17	0.19	0.24	0.31

KR/JM26 Mullite Brick

Item/Grade	KR-26
Type	A	B	C	D
Al₂O₃, %	≥54	≥55	≥56	≥56
Fe₂O₃, %	≤0.9	≤0.9	≤1.0	≤1.0
Bulk Density, g/cm³	0.7	0.8	0.9	1.0
Reheating Linear Change, %	≤-1	≤-0.65	≤-0.5	≤-0.5
Temperature*12h	1400℃
Cold Crushing Strength, MPa	≥2	≥2.3	≥2.8	≥3.2
Thermal Conductivity 350℃, W/(m·K)	0.21	0.25	0.3	0.32

KR/JM28 & KR/JM30 Mullite Brick

Item/Grade	KR-28			KR-30
Type	A	B	C	A	B
Al₂O₃, %	≥64	≥65	≥66	≥72	≥72
Fe₂O₃, %	≤0.75	≤0.65	≤0.65	≤0.55	≤0.55
Bulk Density, g/cm³	0.8	0.9	1.0	1.0	1.1
Reheating Linear Change, %	≤-1	≤-0.8	≤-0.7	≤-0.9	≤-0.7
Temperature*12h	1500℃			1600℃
Cold Crushing Strength, MPa	≥2.3	≥2.8	≥3.3	≥3.0	≥3.5
Thermal Conductivity 350℃, W/(m·K)	0.28	0.32	0.34	0.4	0.43

Common Grades of Mullite Insulation Bricks

In addition to the regular JM series, Keru also provides B grades, C grades and other grades of insulation bricks.

JM series: JM23, JM26, JM28, JM30;
B series: B4, B5, B7;
C series: C1, C2;

B Series Mullite Insulation Bricks — B Series

Quality Production of Kerui Mullite Insulation Bricks

Selected Raw Materials

Mullite bricks are insulating bricks made primarily from mullite. Mullite is a mineral compound composed mainly of aluminum oxide and silicon dioxide. Small amounts of glass phase, cristobalite, and corundum are also part of its composition. This brick has a unique crystal structure, with aluminum oxide content ranging between 70-78%. It has low impurity content. So, it is a popular choice for raw materials in high-temperature industries.

Quality Production

After firing, the aluminum oxide content in mullite insulation bricks ranges from 42-72%. Its main components include mullite, additives, and others. Mullite insulation bricks exhibit excellent properties such as resistance to acid and alkali erosion, low thermal conductivity, uniform expansion, and so on. Additionally, these insulation bricks have good workability and plasticity. These features enhance convenience in transportation and construction processes.

Kerui Mullite Insulation Bricks At Factory

Checking of Mullite Insulation Bricks for South Korean Customer

Video of Kerui Mullite Insulation Brick

This video gives you a comprehensive understanding of Kerui’s mullite insulation bricks. First, its appearance and texture are shown up close. Then, you will walk into the production workshop and see how the workers operate. The entire process is a mature and reliable conventional process, focusing on quality control at every step.

Properties of Mullite Insulating Bricks

High Refractoriness

The mullite insulating brick has a high refractoriness, reaching up to 1790 degrees Celsius. The load softening temperature is approximately 1600-1700 degrees Celsius. It is suitable for use in high-temperature environments and has a long service life.

Low Thermal Fusion

Insulation brick features low thermal fusion, low thermal conductivity, low density, and light weight. These features provide effective thermal insulation to help maintain furnace temperatures and reduce heat loss.

Low Creep at High Temperatures

Mullite insulating bricks have high strength, low creep at high temperatures, and good thermal shock stability. They exhibit strong volume stability at high temperatures. And they can maintain a stable structure during rapid temperature changes.

Strong Chemical Resistance

This type of brick has extremely strong resistance to acid and alkali erosion. It will not corrode or damage when used in acidic or alkaline working environments. It can maintain equipment stability and reduce equipment wear and tear. This is crucial for the high-temperature industry. This feature makes it suitable for long-term use in corrosive environments.

Environmental Friendly

Environmentally friendly, the high temperature fiber board is a tasteless, non-toxic, eco-friendly material composed of natural ingredients without harmful substances. It does not emit harmful gases at high temperatures during use and can be recycled for reuse after consumption, helping to reduce pollution and waste.

Low Impurity Content

Mullite insulating bricks have high purity and low impurity content. This factor results in stable performance and durability. Many customers choose this kind of bricks in high-temperature industry.

Checking of Kerui Mullite Insulation Bricks

Industrial Implementation Scenarios of Kerui Mullite Bricks

Steel Smelting Industry

The mullite insulation brick in the steel metallurgy industry is mainly used to reduce heat loss in high-temperature environments. It is commonly used in the construction of hot blast stoves, blast furnaces, annealing furnaces, resistance furnaces, aluminum reduction cells, and insulation furnaces.

High-Temperature Industrial Kiln

In the building materials industry, there is a high demand for mullite insulation bricks to maintain temperature and corrosion resistance. They are used in glass melting furnaces, glass heat storage chambers, cement kilns, rotary kilns, bell kilns, ceramic sintering kilns, high-temperature ceramic furnaces, and so on.

Petrochemical Industry

In the petrochemical industry, mullite bricks improve energy efficiency. They are used in petroleum fractionation furnaces, ethylene pyrolysis furnaces, pyrolysis furnaces, conversion furnaces, heating equipment, petrochemical combustion pits, and other equipment.

Power Generation Industry

In the power generation industry, mullite insulation bricks are widely used in boilers, furnaces, incinerators, and so on. They enhance the insulation and efficiency of power generation equipment. And they improve the overall performance of the industry’s equipment.

Kerui Mullite Insultion Bricks is Trusted by Global Industry Leaders

Partners across 50+ countries, including RUSAL, CHALCO, ALBA, POSCO, and PSM, choose Kerui for reliable performance, demonstrating strong recognition and fostering long-term partnerships. View some videos on YouTube.

Kerui Refractory is Your Ideal Expert

Kerui Refractory’s mullite insulation bricks are multifunctional. And they have a long lifespan. When you choose our products, you are not just investing in mullite insulation bricks, but also in quality assurance and peace of mind service. Kerui Refractory provides you with the most suitable insulation bricks and insulation solutions. Please send us your detailed requirements now.