Insulating Firebrick

Insulating Firebrick for High-Temperature

Axim’s insulating firebrick is manufactured from high grade refractory powder and materials in good purity. During the process of production, some organic and multiple filling materials are added according to the specific requirement proportion. By compressed in vacuum and sintered under high temperature, the brick has typical advantages including low thermal conductivity, good thermal shock resistance, low heat capacity and low iron content as well as outstanding mechanical flexibility which has extensive applications in variety of industrial markets.


– Low thermal capacity, low thermal conductivity
– Excellent thermal stability
– High purity and low iron content Excellent thermal resistance with direct access to fire
– Accurate dimension and easy cutting


– Cracking furnace
– Conversion furnace
– Heating equipment
– Refining equipment
– Hot Blast Stove
– Ceramics kiln

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Reliable Supplier of Insulating Firebrick

At Axim Mica, we are renowned across North America as the leading supplier of Insulating Firebrick, setting the pinnacle of quality and reliability. Engineered from the finest refractory powders and materials, our firebricks offer unprecedented thermal management solutions.

Recognized for unparalleled thermal shock resistance and low thermal conductivity, we ensure every brick meets rigorous standards. As North America’s preferred choice, we’re committed to delivering not just firebricks, but a foundation of trust and efficiency for our customers’ high-temperature operational needs.

About Axim Mica’s Insulating Firebricks

Insulating firebricks are specialized refractory bricks offering exceptional insulation properties and thermal stability, pivotal in the development of high-temperature industrial applications. Originating from the need for efficient thermal management solutions, these bricks are manufactured from select refractory powders, undergoing precise processes of compression, vacuum treatment, and high-temperature sintering.

Axim Mica’s insulating firebricks integrate organic fillers to meet specific requirements, presenting a low thermal conductivity, high thermal shock resistance, and low heat capacity. Their evolution reflects a history of innovation, contributing to advancements in energy efficiency and performance in industries globally.

Properties of Insulating Firebricks

Refractory Powder Composition

The core material in our insulating firebricks, chosen for its ability to withstand extreme temperatures without melting or breaking down. This ensures longevity and reliability in high-heat environments.

Organic and Filler Materials

Specific organic compounds and multiple filler materials are added to customize the firebrick's properties. These enhance mechanical flexibility, allowing the firebrick to be used in a variety of industrial applications without compromising structural integrity.

High Purity Levels

Manufactured with materials of good purity, our firebricks have low iron content. This is critical for applications demanding high purity levels to avoid contamination, especially in the metallurgical and ceramics industries.

Vacuum Compression

This production step ensures a dense, uniform structure of the brick, minimizing pores and potential weak spots. It contributes significantly to the brick's insulating properties by reducing pathways for heat transfer.

Sintering under High Temperature

The sintering process bonds the materials at a molecular level, enhancing the brick's overall thermal and mechanical properties. This step ensures the brick can resist thermal shock and maintain its integrity over repeated heating and cooling cycles.

Technical Parameters

Classification Temperature (ASTM C 155)
2300℉ - 3200℉ (1260℃ - 1760℃)
Density (ASTM C 134)
39 - 75 lb/ft³ (618 - 1201 kg/m³)
Modulus of Rupture (ASTM C 133)
124 - 450 psi (0.85 - 3.10 MPa)
Cold Crushing Strength (ASTM C 210)
174 - 609 psi (1.20 - 4.20 MPa)
Percent Linear Change (24hrs @ Soaking Temp. ASTM C 210)
0.0% to -0.7%
Thermal Conductivity (ASTM C 182)
@500℉: 1.0 - 3.9 Btu·in/(ft²·hr·℉), @2000℉: 1.8 - 4.3 Btu·in/(ft²·hr·℉)
Chemical Composition
Al2O3: 45% - 78.3%, SiO2: 20.7% - 50%, Fe2O3: 0.2% - 0.9%, TiO2: 0.5% - 1.3%, CaO & MgO: 0.2% - 1.5%, Alkalies: 0.1% - 0.4%

How Insulating Firebricks Are Made: The General Process

The manufacture of Insulating Firebricks (IFB) involves a series of precise and controlled steps that ensure the bricks meet the high standards required for thermal insulation in industrial applications. Here’s a simplified overview of the general process:

Material Selection and Preparation

The process begins with the selection of high-grade refractory powders and materials. These materials are often mixed with organic and multiple filler materials according to specific proportion requirements to enhance the brick's physical and thermal properties.


The selected materials are thoroughly mixed to ensure a uniform composition. This homogenized mixture is crucial for achieving consistent quality and performance across all bricks.

Molding and Shaping

The mixture is then compressed in vacuum molds to form bricks. This step may involve pressing the material into desired shapes and sizes, depending on the application requirements.

Sintering (High-Temperature Firing)

The shaped bricks are sintered in high-temperature kilns. This process binds the materials together at a molecular level, enhancing the brick's strength, thermal stability, and insulation properties. The sintering temperature and duration depend on the specific type of insulating firebrick being produced.

Quality Checks

After sintering, each brick undergoes stringent quality control checks. These include inspections for dimensions, density, thermal characteristics, and structural integrity to ensure they meet the specified standards.

Finishing Touches and Packaging

Finally, the bricks are finished to the required dimensions, if necessary, and packaged for shipping.

Types of Insulating Firebricks

Standard Duty Insulating Firebricks

Ideal for moderate temperatures up to 2300℉ (1260℃), used mainly for general furnace work and backup insulation.

High-Purity Insulating Firebricks

Suitable for up to 2600℉ (1427℃), these bricks offer lower impurities and are used in environments requiring minimal contamination.

High-Duty Insulating Firebricks

Designed for conditions up to 2800℉ (1538℃), perfect for high-temperature kilns and furnaces requiring structural integrity.

Super-Duty Insulating Firebricks

For the most extreme heat up to 3200℉ (1760℃), offering the best thermal stability for critical high-heat processes.

Low-Iron and Low-Alkali Insulating Firebricks

Tailored for applications sensitive to impurities, used in processes like clean-room furnaces or sensitive alloy production.

Applications of Insulating Firebricks

Insulating Firebricks from Axim Mica are versatile and can be utilized in a wide range of industrial applications due to their excellent insulation properties, thermal stability, and mechanical strength. Here are some of the key applications:

  • Cracking Furnaces

    Essential for petrochemical processing, providing reliable insulation to maintain precise temperature control.

  • Conversion Furnaces

    Used in various chemical processes, IFBs support efficient temperature management and energy conservation.

  • Heating Equipment

    Ideal for high-temperature ovens, heaters, and boilers, where durable and efficient thermal insulation is necessary.

  • Refining Equipment

    In metallurgical processes, IFBs help in maintaining consistent temperatures for refining and processing metals.

  • Hot Blast Stoves

    Critical for blast furnaces in steel production, offering insulation that enhances energy efficiency and process control.

  • Ceramics Kilns

    Provide uniform heat distribution and insulation, crucial for the ceramics industry to achieve desired firing outcomes.

Benefits of Using Axim Mica's Insulating Firebricks

Discover the advantages of incorporating Axim Mica’s Insulating Firebricks into your industrial applications:

  • Maximize Efficiency

    Keep the heat exactly where you need it. Our firebricks ensure your furnaces work smarter, not harder, conserving energy and reducing costs.

  • Enhanced Durability

    Say goodbye to constant replacements. Built to withstand extreme conditions, our firebricks promise a longer lifespan for your equipment.

  • Superior Thermal Control

    Achieve precision in heat management. Our bricks offer exceptional insulation, providing the stable temperatures your processes depend on.

  • Environmentally Friendly

    Embrace sustainability without compromise. Low thermal conductivity means lower energy use, aligning your operations with eco-friendly practices.

  • Simplified Maintenance

    Spend less time on upkeep and more on what matters. Our durable and reliable bricks make maintenance a breeze.

  • Custom Solutions

    Every project is unique. Whatever your industry, we’re here to supply insulating firebricks tailored to your specific needs.

Why Choose Axim Mica for Your Insulating Firebricks

Partner with Axim Mica and experience the difference expertise makes.

Decades of Dedication

With over 20 years of refining our craft and servicing more than 12,000 clients across 50 industries, we bring a wealth of knowledge directly to your projects.

Customized for Your Success

Your unique needs drive our innovation. We tailor solutions that fit seamlessly into your operations, ensuring you achieve optimal results every time.

Quality That Performs

Expect nothing less than excellence. Our insulating firebricks are designed to exceed industry standards, offering you reliability where it counts.

Efficient Operations

Time and energy are precious. Our products are engineered to maximize both, ensuring your processes run smoothly and sustainably.

Support You Can Count On

Navigating the complexities of thermal management should be simple. Our dedicated team is here to guide you every step of the way, from selection to installation.

About Axim Mica

From humble beginnings to a leader in North America’s mica supply, Axim Mica has grown over the past two decades into a provider of world-class insulating materials.

Our unwavering commitment to quality, innovation, and exceptional customer support has cemented our position in over 50 industries.

At Axim Mica, we’re not just supplying products; we’re building lasting partnerships for a brighter, more efficient future.

Quality Assurance at Axim Mica

At Axim Mica, our ISO 9001:2015 certification underscores a deep-rooted commitment to excellence. Through proactive risk-based thinking, lean efficiencies, and a rigorous Quality Management System, we ensure the delivery of consistently high-quality, defect-free insulating materials.

Our dedication spans over two decades, promising reliability and superior performance to save you time and money, emphasizing our pledge to uphold the highest standards of quality production and compliance.

How It Works: Simple 3-Step Process

Step 1: Reach Out

Begin by contacting us with your insulation needs—whether it's for industry-specific advice, product inquiries, or custom solutions. Our team is ready to lend their expertise.

Step 2: Receive Your Quote

After understanding your requirements, we'll provide a detailed quote. Expect competitive pricing tailored to your project's specifics, ensuring you get exactly what you need.

Step 3: Effortless Delivery

Upon order confirmation, we swiftly process and ship your high-quality insulating materials. Rely on us for on-time delivery, ensuring your project moves forward without delay.

Frequently Asked Questions

Insulating fire bricks (IFB) are specialized refractory bricks designed to withstand high temperatures while providing excellent thermal insulation. They are lighter and more porous than traditional refractory bricks, making them ideal for use in furnaces, kilns, and other high-temperature processing environments.

The primary function of insulating brick is to minimize heat loss in furnaces, kilns, and other high-temperature equipment. This ensures efficient energy use, maintains optimal processing temperatures, and protects the equipment’s outer structure from excessive heat.

Insulating fire bricks come in various standard sizes, with common dimensions being 9″x4.5″x2.5″. However, sizes can vary and custom dimensions are often available to meet specific application requirements.

Insulating firebricks are made from high-grade refractory powders and materials, such as silica and alumina, mixed with organic and inorganic fillers. This composition provides the bricks with their lightweight, porous structure and insulating properties, while ensuring they can withstand extreme temperatures.