Cordierite-mullite Refractory Brick

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Specifications

Cordierite-mullite brick
1. low thermal expansion coefficient,
2. excellent stability of thermal shocking

Alumina-Silica Refractory Series Products

Cordierite-mullite brick is of low thermal expansion coefficient, excellent stability of thermal shocking, it is used in assembly brick for hot blast stove.
Sintered mullite brick mineral component is mullite phase. It has the advantage of high temperature structural strength, strong resistance to chemical corrosion. It is used in the lining of high temperature kiln.
Silimanite bricks possesses the better refractoriness temperature under load and the good stability of thermal shocking. It is mainly used in the blast furnace, wind pipe of the blast heating cupola, the lime kiln, the discharging channel and cover board of the glass melting kiln.

Physical and chemical index :

			Sillimanite Bricks	Cordierite brick	Corundum-Mullite Brick		Cordierite-Mullite Brick
	M-68	M-72	GCS	JQS	AM-75	AM-80	JM
Al₂O₃%	≥68	72	≥55	55±5	≥75	≥80	≥50
Fe₂O₃ %	≤1.5	≤1.5	≤1.5	≤1.5			≤2
MgO %				2.0			1.73~3
SiO₂ %							≤45
Apparent Porosity %	≤21	≤19	≤17	≤25	≤17	≤17	≤23
Bulk Density g/cm³	≥2.45	≥2.50	≥2.45	≥2.30	≥2.55	≥2.60	≥2.30
Cold Crushing Strength Mpa	≥50	≥60	≥55	≥40	≥70	≥70	≥70
Modulus of Rupture Mpa					≥15	≥15
0.2Mpa Refractoriness Under Load T_0.6	≥1580	≥1600	≥1550 (T₂)	≥1400	≥1680	≥1700
Reheat liner change 2h				1450°C ±0.2
Thermal Shock Resistances 100°C water cycles			≥15				≥100
20-1000°C Thermal Expansich 10^-6/°C	4.5-4.9

Q: Are insulating fire bricks safe to use?: Yes, insulating fire bricks are safe to use. They are specifically designed to withstand high temperatures and are made from non-toxic materials that do not emit harmful gases or substances when heated. They provide excellent insulation and are commonly used in various applications such as kilns, furnaces, and fireplaces.

Q: Are insulating fire bricks easy to cut or shape?: Compared to other bricks, insulating fire bricks offer a relatively simple cutting and shaping process. This is mainly because of their lower density and composition, enabling easier manipulation using standard masonry tools. However, it is crucial to acknowledge that the level of simplicity can differ depending on the specific type and brand of insulating fire brick. Some may demand special tools or techniques for cutting or shaping, while others may be more user-friendly. To ensure accurate cutting or shaping techniques, it is always advisable to refer to the manufacturer's instructions or seek professional guidance when working with insulating fire bricks.

Q: Can insulating fire bricks be used in the construction of glass fusing kilns?: Yes, insulating fire bricks can be used in the construction of glass fusing kilns. These bricks have excellent insulating properties, which helps in maintaining consistent and controlled temperatures inside the kiln. Additionally, they can withstand high temperatures without cracking or breaking, making them suitable for glass fusing kilns.

Q: Can insulating fire bricks be used for insulation in hot water tanks?: Indeed, insulating fire bricks are suitable for insulating hot water tanks. Their superior thermal insulation properties deem them an optimal selection for such purpose. By utilizing these bricks, heat loss from the hot water tank can be efficiently prevented, consequently prolonging the water's temperature retention. Furthermore, these bricks exhibit exceptional durability and can endure high temperatures without fracturing or shattering, rendering them a dependable option for hot water tank insulation.

Q: Are insulating fire bricks resistant to acids?: Insulating fire bricks, known as refractory bricks as well, exhibit a general resistance towards acids. They are crafted from materials that can withstand high temperatures, namely silica, alumina, and other refractory oxides, which grant exceptional resistance against chemical attacks. Nevertheless, it must be emphasized that the degree of acid resistance may differ based on the precise composition and manufacturing technique employed in the production of these insulating fire bricks. It is advisable to seek guidance from the manufacturer or supplier to acquire comprehensive information regarding the acid resistance of the specific variant of insulating fire bricks being utilized.

Q: Can insulating fire bricks be used in combination with other insulation materials?: Insulating fire bricks can be utilized alongside other insulation materials to maximize their thermal insulation capabilities. Renowned for their exceptional thermal insulation properties, insulating fire bricks are commonly employed in kilns, furnaces, and fireplaces to effectively minimize heat transfer. However, attaining optimal thermal efficiency may necessitate additional insulation in certain instances. By merging insulating fire bricks with alternative insulation materials, the overall insulation performance can be significantly augmented. For instance, ceramic fiber blankets or boards can be employed in conjunction with insulating fire bricks to furnish supplementary insulation and bridge any gaps or joints between the bricks. This amalgamation aids in minimizing heat loss and elevating energy efficiency. Moreover, utilizing multiple insulation materials can confer additional advantages, such as heightened fire resistance, enhanced sound insulation, and fortified structural integrity. By skillfully combining diverse insulation materials, a more efficacious insulation system can be fashioned to meet the specific requirements of various applications. When combining different insulation materials, it is imperative to consider their compatibility and adherence to one another. Each material may possess distinct thermal properties, density, and installation prerequisites, necessitating strict adherence to the manufacturer's recommendations and guidelines for appropriate installation. In conclusion, the utilization of insulating fire bricks in conjunction with other insulation materials is instrumental in augmenting thermal insulation and overall performance across diverse applications. However, ensuring compatibility and adhering to proper installation guidelines is vital in order to achieve optimal outcomes.

Q: Are insulating fire bricks resistant to thermal spalling?: Yes, insulating fire bricks are resistant to thermal spalling. Thermal spalling refers to the phenomenon where a material cracks or breaks due to rapid temperature changes or thermal shock. Insulating fire bricks are specially designed to withstand high temperatures and thermal cycling without spalling. They have a low thermal conductivity, which means they can effectively insulate against heat transfer and minimize the stress caused by thermal expansion and contraction. Additionally, the composition and structure of insulating fire bricks are engineered to provide excellent resistance to thermal spalling, making them a reliable choice for applications that involve extreme heat conditions.

Q: Are insulating fire bricks resistant to alkali attack?: Insulating fire bricks generally possess resistance to alkali attack. They are composed of high-temperature refractory materials and are engineered to endure extreme temperatures and chemical surroundings. Alkalis typically corrode and deteriorate certain substances, but insulating fire bricks are specifically devised to withstand this form of chemical assault. They possess limited porosity and a compact structure, thereby thwarting alkalis from infiltrating the brick's surface. Furthermore, the refractory materials employed in these bricks possess a high melting point and exhibit chemical inertness, rendering them ideal for situations where exposure to alkali is a concern. However, it is crucial to acknowledge that the resistance of insulating fire bricks to alkali attack may vary depending on the brick's composition, manufacturing process, as well as the concentration and duration of alkali exposure. Thus, it is always advisable to consult the manufacturer or supplier for comprehensive details regarding the alkali resistance of their specific insulating fire bricks.

Q: Can insulating fire bricks be used in chimney construction?: Yes, insulating fire bricks can be used in chimney construction. These bricks have high heat resistance and low thermal conductivity, making them suitable for lining chimneys and other high-temperature applications. They help to insulate the chimney and prevent excessive heat transfer, reducing the risk of structural damage and improving energy efficiency.

Q: Can insulating fire bricks be used in cement kilns?: Yes, insulating fire bricks can be used in cement kilns. Insulating fire bricks are designed to have low thermal conductivity, which makes them ideal for insulating high-temperature environments such as cement kilns. These bricks can help to reduce heat loss and improve energy efficiency in the kiln. Additionally, their lightweight nature makes them easier to handle and install in the kiln. However, it is important to ensure that the insulating fire bricks selected are compatible with the specific operating conditions and requirements of the cement kiln to ensure optimal performance and longevity.

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