Mullite insulation brick

Description

Mullite insulation brick is a kind of insulating brick primarily made from mullite as the main raw material, with an alumina content generally ranging from 40% to 77%. The mineral composition, in addition to mullite, includes small amounts of glass phase and quartz when the alumina content is relatively low. whereas, when the alumina content is higher, small amounts of corundum are present. This product features low thermal conductivity, low thermal expansion, low impurity content, high resistance to high temp, high compressive strength and excellent thermal shock resistance.Moreover, they can be processed into special shapes and in direct contact with the fire side.

Advantages of Mullite Insulation Bricks

Specifications

Item		Grade
		MG-23	MG-25	MG-26	MG-27	MG-28	MG-30	MG-32
ω(Al₂O₃)/%	≥	40	50	55	60	65	70	77
ω(Fe₂O₃)/%	≤	1.0	1.0	0.9	0.8	0.7	0.6	0.5
Bulk density/(g/cm³)	≤	0.55	0.80	0.85	0.90	0.95	1.05	1.35
CCS / MPa	≥	1.0	1.5	2.0	2.5	2.5	3.0	3.5
	Min	0.9	1.3	1.8	2.2	2.2	2.7	3.2
HPLC（T/℃×12h）/%	T/℃	1230	1350	1400	1450	1510	1620	1730
λ/[W/(m·k)]≤（±25℃）	200	0.18	0.26	0.28	0.32	0.35	0.42	0.56
	350	0.20	0.28	0.30	0.34	0.37	0.44	0.60
	600	0.22	0.30	0.33	0.36	0.39	0.46	0.64
R.U.L. (0.2 MPa T0.6) / ℃ ≥		1080	1200	1250	1300	1360	1470	1570

Product Size: We offer refractory brick sizes that comply with ISO, EN, ASTM, JIS, etc, and customized sizes.

Applications of Mullite Insulation Bricks

Mullite insulation bricks are used as insulation layers for hot blast furnace roofs, blast furnace bodies and bottoms, heating furnaces and annealing furnaces.

They are also suitable as lining materials for cracking furnaces, tubular heating furnaces and gas generators.

In ceramic and glass furnace applications, mullite insulation bricks can be used in ceramic roller kilns, regenerator chambers of glass melting furnaces and ceramic sintering kilns.

Certificates and Patents

JHYRef is certified under ISO 9001, ISO 14001 and ISO 45001 management systems, reflecting standardized quality control, environmental management and occupational health and safety practices throughout production.

Our patented refractory-related technologies and standardized production control help support stable product quality, responsible manufacturing and reliable long-term supply.

Quality Assurance

Each batch of mullite insulation bricks is tested under strict quality control procedures to ensure stable insulation performance and compliance with project requirements. Key performance indicators include Al₂O₃ content, Fe₂O₃ content, bulk density, cold crushing strength, permanent linear change, thermal conductivity and refractoriness under load.

Dimensional accuracy, appearance quality and packing condition are also inspected before delivery. Testing procedures can be carried out according to international standards such as ISO, ASTM and EN, and batch-specific test reports are available upon request.

Shelf Life and Packaging

Shelf life: 24 months under proper storage conditions.
Packaging: Mullite insulation bricks are packed on trays of 1000 kg or 1500 kg, with export-standard protection suitable for storage, handling and long-distance transportation.

Technical Support and Services

JHYRef provides technical support for mullite insulation brick projects, including product specification confirmation, customized size recommendations, installation drawing review and refractory lining guidance.

For furnace projects, our team can also support special-shaped brick customization, refractory castable matching, installation supervision and other project-based refractory solutions.