Max Service Temperature: Rated for environments up to 1700°C (3100°F).
Al2O3 Content: Available in grades ranging from 35% to 85% Alumina.
Cold Crushing Strength (CCS): >= 50 MPa (High Alumina Grade), ensuring hole edges remain sharp and crack-free.
Dimensional Tolerance: Standard +/- 1mm (High-precision CNC machining available).
Hole Range: Custom diameters from 5mm to 200mm+, supporting single, multiple, or honeycomb patterns.
(1) Good volume stability;
(2) Excellent high temperature load creep performance;
(3) High density, low porosity;
(4) Strong heat exchange capacity and large heat storage area;
(5) Strong pressure resistance and good corrosion resistance;
(1) Mainly used for the partition walls of the carbonization chamber and combustion chamber of the coke oven, the heat storage chamber and slag chamber of the steelmaking open hearth furnace, the soaking furnace, the refractory materials of the glass melting furnace and the vault and other load-bearing parts of the ceramic firing kiln.
(2) Also used for the high-temperature load-bearing parts of the hot blast furnace and the top of the acid open hearth furnace.
|
Item |
High Alumina Checker Brick |
Micro-expansion high alumina bricks |
|||
|
Grade |
RSGL-75 |
RSGL-65 |
RSGL-55 |
RSWPL-75 |
|
|
Chemical element content% |
Al2O3≥ |
75 |
65 |
55 |
75 |
|
Fe2O3≥ |
2.0 |
2.0 |
2.5 |
2.0 |
|
|
Refractory degree/℃,≥ |
1790 |
||||
|
Load softening start temperature/℃,0.2MPa |
1500 |
1470 |
1450 |
1520 |
|
|
Apparent porosity/%≤ |
20 |
22 |
23 |
19 |
|
|
Compressive strength at room temperature/MPa,≥ |
60 |
55 |
40 |
70 |
|
|
Volume density/(g/cm3),≥ |
2.5 |
2.4 |
2.3 |
2.6 |
|
|
Linear change rate/%,(1500℃×2h) |
0—0.2 |
0—-0.2 |
±0.2 |
0-0.6 |
|
Fire Brick with Holes: Precision Engineering for Specialized Thermal Applications
In modern furnace design and kiln construction, standard solid bricks are often insufficient for complex heat management. The fire brick with holes (also known as perforated refractory brick or burner block) is a critical component designed to facilitate fuel injection, air circulation, or the installation of heating elements. These specialized bricks allow for the seamless integration of mechanical and electrical components into the refractory lining without compromising the structural integrity of the furnace.
Highland Refractory is a leading manufacturer of high-precision fire bricks with holes. We understand that in high-temperature environments, a hole is not just an opening—it is a point of potential thermal stress. Our bricks are engineered to maintain their mechanical strength and dimensional stability even when subjected to extreme temperature gradients.
The Utility of Perforated Refractory Bricks
Why do engineers and kiln builders specifically search for fire bricks with holes? The applications are as diverse as the industries that use them.
Burner and Nozzle Ports: In gas-fired kilns, a large central hole allows for the insertion of a burner nozzle. These "Burner Blocks" are often the most critical part of the furnace, as they are exposed to direct flame and must resist both extreme heat and chemical erosion from fuel combustion.
Electric Heating Element Supports: In electric kilns and laboratory furnaces, fire bricks with holes (or grooved bricks) are used to house and support heating coils. The holes protect the elements from shifting while ensuring that heat is evenly radiated into the chamber.
Air Circulation and Ventilation: In certain types of ovens, such as wood-fired pizza ovens or specialized industrial heaters, perforated bricks are used to create "ventilation pathways." This ensures a consistent supply of oxygen for combustion and helps in balancing the internal pressure of the kiln.
Thermocouple and Sensor Entry: To monitor the internal temperature of a furnace, sensors must pass through the refractory wall. Pre-drilled fire bricks provide a clean, thermally stable entry point for these sensitive instruments.
Material Grades and Technical Capabilities
At Highland Refractory, we offer fire bricks with holes in multiple material compositions to suit your specific operating temperature.
Fireclay Perforated Bricks (Al2O3 35% - 45%)
Ideal for lower-temperature applications such as pizza ovens, fireplaces, and small craft kilns. These bricks offer excellent thermal shock resistance and are easy to cut or modify on-site. Rated for service up to 1350 degrees Celsius.
High Alumina Perforated Blocks (Al2O3 55% - 85%)
Specifically designed for industrial burner ports and heavy-duty heating element supports. These bricks have high refractoriness-under-load and can withstand temperatures up to 1700 degrees Celsius. They are highly resistant to chemical slag and mechanical abrasion.
Silicon Carbide (SiC) Perforated Tiles
When extreme thermal conductivity and maximum abrasion resistance are required, our SiC bricks with holes are the premier choice. These are often used in waste-to-energy plants and specialized metallurgical furnaces.
Technical Specifications:
Hole Diameters: From 5mm (for sensors) to 200mm+ (for burner ports).
Hole Patterns: Single hole, double holes, honeycomb patterns, or custom multi-hole arrays.
Dimensional Tolerance: We maintain a strict tolerance of +/- 1mm to ensure that your heating elements or burners fit perfectly every time.
Cold Crushing Strength: Even with perforations, our bricks maintain a CCS of over 25 MPa for fireclay and over 50 MPa for high alumina grades.
Customization: OEM Solutions for Unique Geometries
One of the biggest pain points for buyers of "fire brick with holes" is finding a supplier that can match a specific 2D or 3D drawing. Standard off-the-shelf bricks often don't have the right hole placement or diameter for modern industrial equipment.
Highland Refractory’s Customization Process:
Bespoke Tooling: We can create custom molds for high-volume orders, ensuring that every hole is perfectly centered and consistent across thousands of units.
CNC Precision Drilling: For low-volume or highly complex prototypes, we use diamond-tipped CNC drills to post-process fired bricks. This allows us to achieve incredibly tight tolerances and complex internal hole geometries that are impossible with standard molding.
Technical Consultation: Our engineers can help you calculate the minimum "wall thickness" between holes to prevent the brick from cracking under thermal expansion.
Why Highland Refractory is the Preferred Export Partner
Operating from our specialized facility, we serve B2B clients across the USA, Europe, and Southeast Asia. We understand that international trade requires more than just a quality product—it requires reliability and transparency.
Global Export Experience: We are familiar with the specific import requirements and standards of North American and European markets (ASTM, ISO).
Quality Control Documentation: Every shipment of our perforated bricks comes with a comprehensive lab report covering Alumina content, bulk density, and dimensional verification.
Optimized Logistics: Small bricks with holes can be fragile. We use reinforced, steel-banded wooden crates and individual foam dividers to ensure that your bricks arrive without a single chip or crack, whether you are in California, Germany, or Vietnam.
Frequently Asked Questions (FAQ)
Q: Does drilling a hole in a firebrick make it more likely to crack?
A: If the hole is poorly placed or the brick is made from low-quality materials, yes. However, Highland Refractory uses optimized grain sizing and controlled firing cycles to ensure that the material around the hole is just as strong as the rest of the brick.
Q: Can I get a fire brick with a "tapered" hole?
A: Yes. Tapered holes are common in burner blocks to help shape the flame. We can manufacture these using either specialized molds or CNC machining.
Q: What is the maximum number of holes you can put in a standard 9-inch brick?
A: This depends on the diameter of the holes. Generally, we recommend maintaining at least 15mm of solid material between holes to ensure structural stability at high temperatures.
Q: Are these bricks suitable for electric kilns?
A: Absolutely. Our 3000F rated perforated bricks are the industry standard for supporting heating elements in both hobbyist and industrial electric kilns.
Upgrade Your Furnace Performance with Highland Refractory
Precision is the key to efficiency. By choosing Highland Refractory for your fire bricks with holes, you are ensuring that your equipment operates at peak performance with minimal maintenance. From custom burner tiles to specialized sensor ports, we provide the refractory solutions that keep your industry moving forward.
Silicon carbide plates are mainly composed of silicon carbide (SiC) as the aggregate (with a content usually ≥ 80%).
