As a result, we deliver factory-direct pricing, consistent brick quality, and fast delivery. Similarly, this applies to all your furnace, kiln, boiler, and high-temperature equipment lining projects.
In addition, we produce these lightweight mullite insulating firebricks in the JM23, JM26, JM28, JM30, and JM32 series with classification temperatures from 1260°C to 1550°C. Meanwhile, we comply with ASTM C155 and ASTM C467. Therefore, engineers and contractors rely on them for hot face linings and backup insulation in the most demanding high-temperature environments.
Technical Specifications of Mullite Insulation Bricks
To begin with, we manufacture our mullite insulation bricks in a range of grades and densities. Specifically, the table below summarizes the standard JM series product range.
| Grade | Classification Temp. | Al₂O₃ (%) | Fe₂O₃ (%) | Bulk Density (g/cm³) | Cold Crushing Strength (MPa) | Thermal Conductivity 350°C (W/m·K) |
|---|---|---|---|---|---|---|
| JM23 | 1260°C – 1300°C | ≥ 40 – 42 | ≤ 1.2 | 0.6 | ≥ 1.0 – 1.5 | 0.18 – 0.19 |
| JM26 | 1400°C | ≥ 54 – 56 | ≤ 0.9 – 1.0 | 0.8 | ≥ 2.0 – 2.3 | 0.23 – 0.25 |
| JM28 | 1510°C – 1540°C | ≥ 64 – 67 | ≤ 0.7 – 0.8 | 0.85 – 0.9 | ≥ 2.3 – 2.8 | 0.25 – 0.32 |
| JM30 | 1620°C – 1650°C | ≥ 72 – 73 | ≤ 0.6 – 0.7 | 1.0 | ≥ 2.6 – 3.3 | 0.33 – 0.41 |
| JM32 | 1730°C – 1760°C | ≥ 77 | ≤ 0.5 | ≥ 1.25 | ≥ 3.5 | 0.49 |
Material & Physical Specifications for Mullite Insulating Firebricks
- To begin with, we use high-purity mullite clinker as the base for our mullite insulation bricks. The bricks are manufactured using the advanced burnout additive process (foam method), which produces a uniform pore structure for excellent insulating properties.
- Moreover, our bricks have a bulk density of 0.6 to 1.25 g/cm³, significantly lighter than dense firebricks. This reduces the structural load on furnace shells and kiln foundations.
- Additionally, we manufacture standard brick dimensions of 230 × 114 × 65 mm and 230 × 114 × 76 mm. Custom shapes and sizes are available on request.
- Furthermore, our bricks achieve a permanent linear change of ≤ 1.0% (12-hour holding), ensuring dimensional stability at high temperatures.
- For special orders, we supply JM26HD and JM28HD high-density versions for applications requiring higher mechanical strength.
- Finally, we offer OEM & ODM — we customize density, dimensions, temperature grade, and packaging according to your specifications.
Why Choose Our Thermal Mullite Insulation Bricks?
In fact, mullite insulation brick is the industry standard for high-temperature insulation because it offers low thermal conductivity, low heat storage, and excellent thermal shock resistance. Furthermore, it is lightweight and can be used as a hot face lining directly exposed to flames.
- First, our bricks offer low thermal conductivity. This minimizes heat transfer through the kiln walls, keeping the outer shell cool and retaining heat inside the furnace.
- Second, they provide low heat storage. The lightweight structure absorbs less heat, allowing faster heating and cooling cycles — vital for batch kilns and intermittent operations.
- Third, they deliver excellent thermal shock resistance. The mullite crystal structure withstands rapid temperature changes without cracking or spalling.
- Fourth, they ensure high compressive strength. Despite their low density, our bricks provide reliable structural integrity for hot face and backup applications.
- Finally, they provide high purity and low impurity content. Low iron and alkali content ensures high refractoriness under load and resistance to reducing atmospheres.
Applications & Industries for Mullite Insulation Bricks
- For instance, in ceramic and porcelain kilns, our bricks provide hot face linings for shuttle kilns, roller kilns, and tunnel kilns, reducing thermal mass and fuel consumption.
- Also, in petrochemical heaters and reformers, they insulate process heaters, ethylene cracking furnaces, synthetic ammonia conversion furnaces, and tubular heaters.
- In addition, for metallurgical furnaces, they line stress relieving furnaces, annealing furnaces, and heat treating furnaces in iron and steel plants.
- Furthermore, in glass industry furnaces, they provide backup insulation for glass melting tanks and regenerators.
- Lastly, in lithium battery cathode baking kilns, they provide reliable thermal insulation for high-temperature processing.
About Our Factory — Direct Manufacturer of Mullite Insulation Bricks
In fact, Tarco Industry operates a modern manufacturing facility. Specifically, we dedicate it to the production of mullite insulation bricks and high-temperature insulation products.
Furthermore, we complete every step in our own factory. This includes raw material preparation, mixing, forming, drying, firing, and precision machining. Consequently, we do not outsource production. We do not act as a middleman.
In addition, we equip our factory with advanced mixing lines, hydraulic presses, and precision grinding systems. As a result, we produce high-quality mullite insulation bricks with consistent density, uniform pore structure, and tight dimensional tolerances (±1 mm).
Therefore, whether you need standard JM23 bricks or high-temperature JM30 bricks, Tarco Industry can produce them directly for you.
Factory Direct Advantages
- First, we are a Manufacturer, Not a Trader. You buy directly from Tarco Industry production lines, eliminating middleman markups.
- Second, we handle In-House Production. We control raw material preparation, brick forming, and firing all under one roof for full quality control.
- Third, we welcome OEM & ODM. We customize density, dimensions, temperature grade, and packaging.
- Fourth, we maintain Bulk Production Capacity. We ensure stable output for large furnace and kiln projects.
- Finally, we provide Factory Price. We offer competitive direct pricing for distributors, refractory contractors, and OEMs.
How to Install Mullite Insulation Bricks
- First, prepare the furnace shell surface. Clean the steel shell to remove rust, scale, oil, and moisture.
- Then, prepare the mortar. Mix high-temperature refractory mortar according to the manufacturer’s instructions for the specific brick grade.
- Next, lay the bricks. Apply a thin, uniform layer of mortar (≤ 1 mm for precision-ground bricks) and place each brick firmly in position. Stagger joints between courses to prevent heat leakage.
- After that, check alignment. Ensure the brickwork is level, plumb, and aligned. Tap each brick into place to achieve a tight joint.
- Finally, cure and dry the lining. Follow the specified curing and heat-up schedule to remove moisture gradually and avoid steam spalling.
Frequently Asked Questions (FAQ)
What is the difference between mullite insulation brick and ceramic fiber?
Mullite insulation brick is a rigid, self-supporting refractory brick with higher mechanical strength and better resistance to gas flow erosion. In contrast, ceramic fiber is a flexible, lightweight blanket or module with lower density and lower heat storage. Therefore, mullite bricks are preferred for hot face linings requiring structural integrity, while ceramic fiber is ideal for backup insulation and rapid cycling applications.
Can JM26 and higher grades be used as hot face lining?
Yes. Our JM26, JM28, JM30, and JM32 grades are designed for direct flame contact. Furthermore, they provide excellent resistance to thermal shock and chemical attack, making them suitable for primary hot face linings in ceramic kilns, petrochemical heaters, and metallurgical furnaces.
What is the maximum service temperature of mullite insulation bricks?
Our mullite insulation bricks are available in classification temperatures from 1260°C (JM23) to 1730°C (JM32). However, the continuous service temperature depends on the specific grade and application conditions. Therefore, you should select the grade based on your actual operating temperature with an appropriate safety margin.
Quality Assurance & Certifications
Furthermore, Tarco Industry manufactures our mullite insulation bricks under strict quality control. Specifically, they comply with ASTM C155, ASTM C467, ASTM C134, and ASTM C133 standards.
As a result, we perform density testing, cold crushing strength testing, thermal conductivity testing, permanent linear change testing, and chemical composition analysis. Moreover, we test every production batch before shipment.
- Additionally, we offer certifications including ISO 9001, CE, and SGS.
- Similarly, our production capacity reaches 1,000 tons per month.
- Also, we set the MOQ at 1,000 pcs (negotiable for sample orders).
- In terms of packaging, we offer wooden pallets with plastic wrapping, custom marking available.
- Finally, we deliver within 15–20 business days after order confirmation.
Request a Quote for Thermal Mullite Insulation Bricks
In conclusion, we are Tarco Industry. We are a direct manufacturer of thermal mullite insulation bricks and lightweight insulating firebricks.
Therefore, because we produce in our own factory, we offer competitive factory-direct pricing. In other words, you deal with no middleman and no trading company markup.
📩 Contact Tarco Industry now for a free sample or bulk quotation. Additionally, our engineering team can assist you in selecting the right grade, density, and dimensions for your specific furnace or kiln application.
Tarco Industry — We Produce, We Manufacture, We Supply Directly.
