Lightweight, Low Thermal Conductivity (0.1-0.4 W/m・K), 800-1400℃ Service Temp | Factory Direct Supply
① Excellent Insulation: λ=0.1-0.4 W/m・K (ASTM C177 Test)
② High-Temp Resistance: 800-1400℃ (Long-Term Service)
③ Easy Installation: Density 0.8-1.0 g/cm³, Easy to Cut
Trusted heat-insulating bricks supplier for steel, cement, ceramic, and glass industries worldwide.
Heat-insulating bricks (also called insulating fire bricks/IFBs) are porous, lightweight refractory materials engineered to minimize heat transfer in high-temperature environments. Unlike dense fire bricks, their core function is thermal insulation, achieved through a porous structure that traps air (a poor heat conductor). They are widely used in industrial kilns, furnaces, and high-temperature equipment to reduce heat loss, lower energy consumption, and protect external structures from overheating.
① Porous Structure: Apparent Porosity 40-70% (ASTM C20 Test). The high porosity creates tiny air pockets that trap heat, blocking both conduction and convection—similar to how a foam blanket retains body heat. This porous nature is the key to their insulation performance.
② Low Thermal Conductivity: 0.1-0.4 W/m·K at 350℃ (ASTM C177 Test). Thermal conductivity (λ) measures heat transfer efficiency; lower values mean better insulation. Compared to dense fire bricks (λ=0.8-1.2 W/m·K), heat-insulating bricks reduce heat loss by 60-70%.
③ Lightweight: Density 0.8-1.0 g/cm³ (ASTM C271 Test). They are 50-60% lighter than dense fire bricks (density 2.2-2.6 g/cm³), making them easy to cut with ordinary tools (e.g., a hacksaw), transport, and install without heavy machinery—ideal for on-site retrofits.
④ Temperature Range: Long-term service temperature 800-1400℃, short-term peak temperature up to 1600℃ (ASTM C1275 Test). The exact range varies by material composition, allowing适配 to different high-temperature工况.
Key Difference from Dense Fire Bricks: Heat-insulating bricks prioritize thermal insulation over mechanical strength, while dense fire bricks focus on high-temperature resistance and load-bearing capacity. This means heat-insulating bricks are ideal for non-load-bearing insulation layers (e.g., kiln cold faces), while dense bricks are used for high-stress, direct-flame areas (e.g., kiln burning zones).
|
Performance Parameter |
Value Range |
Test Standard |
Core Value for Users |
|---|---|---|---|
|
Thermal Conductivity (λ) |
0.1-0.4 W/m·K (350℃) |
ASTM C177 |
Minimizes heat loss, reduces energy cost by 25-35% annually |
|
Long-Term Service Temp |
800-1400℃ |
ASTM C1275 |
Adapts to different high-temp working conditions (low/mid/high temp) |
|
Density |
0.8-1.0 g/cm³ |
ASTM C271 |
Lightweight, easy to install, reduces labor and transportation costs |
|
Apparent Porosity |
40-70% |
ASTM C20 |
Enhances insulation via air trapping, improves energy-saving effect |
|
Compressive Strength |
3-8 MPa |
ASTM C133 |
Meets non-load-bearing insulation needs, avoids deformation in use |
|
Thermal Shock Cycles |
≥30 (1100℃→20℃) |
ASTM C1171 |
Resists temperature swings, avoids cracking, extends service life |
All parameters are tested in strict accordance with international standards to ensure data accuracy and product stability. We provide detailed test reports for each batch of heat-insulating bricks.
Different types of heat-insulating bricks vary in material composition, performance, and application scenarios. Choosing the right type based on your industry and equipment is critical to maximizing insulation efficiency and service life.
Key Params: λ=0.1-0.2 W/m·K (350℃); Long-term temp: 800-1200℃; Density: 0.6-0.8 g/cm³; Apparent Porosity: 60-70%
Ideal Scenarios: Laboratory furnaces, small industrial ovens, kiln cold faces (ceramic/glass industry), building fireplace inserts, and low-temperature heat insulation equipment.
Advantage: Ultra-low thermal conductivity, best for energy-saving needs; ultra-lightweight, easy to cut into complex shapes; suitable for small-batch, customized projects.
Key Params: λ=0.2-0.3 W/m·K (350℃); Long-term temp: 1200-1400℃; Al₂O₃≥40%; Density: 0.8-1.0 g/cm³
Ideal Scenarios: Cement kiln cold faces, hot blast stove insulation layers (steel industry), ceramic kiln transition zones, and mid-high temperature industrial equipment.
Advantage: Balances insulation performance and high-temperature stability; better mechanical strength than ceramic fiber bricks; suitable for continuous high-temperature operation.
Key Params: λ=0.12-0.25 W/m·K (350℃); Long-term temp: 1000-1300℃; Density: 0.7-0.9 g/cm³; Apparent Porosity: 55-65%
Ideal Scenarios: Industrial boiler insulation, power plant furnace insulation layers, building exterior wall insulation (high-temperature areas), and small workshop kilns.
Advantage: Super lightweight, reduces structural load; good thermal shock resistance; cost-effective for medium-temperature insulation needs.
Key Params: λ=0.25-0.4 W/m·K (350℃); Long-term temp: 1300-1400℃; Al₂O₃≥50%; Compressive Strength: 6-8 MPa
Ideal Scenarios: Glass melting furnace insulation layers, non-ferrous smelting kilns, petrochemical high-temperature reactors, and high-temperature industrial kilns with strict insulation requirements.
Advantage: Excellent high-temperature resistance; good wear and slag erosion resistance; suitable for harsh mid-high temperature working environments.
Our heat-insulating bricks are engineered to solve industrial insulation pain points (high energy consumption, frequent maintenance, poor stability). Each advantage is verified by data and real customer cases.
Data: Thermal conductivity as low as 0.1 W/m·K, reducing heat loss by 60-70% compared to dense fire bricks and 20-30% compared to generic insulating bricks.
Case: A Chinese ceramic factory retrofitted its kiln cold faces with our ceramic fiber heat-insulating bricks. After 12 months of operation, the factory’s natural gas consumption decreased by 32%, saving approximately $48,000 in energy costs annually.
User Value: Significantly lowers energy costs, improves production efficiency, and meets global energy-saving and emission-reduction requirements.
Data: ≥30 thermal shock cycles (1100℃→20℃, ASTM C1171 Test), service life 1.5-2 times longer than generic heat-insulating bricks (average service life 18-24 months vs. 10-12 months).
Case: A Indian steel mill replaced its old insulation bricks with our alumina-silica heat-insulating bricks for hot blast stoves. The insulation layer maintained structural integrity for 24 months, compared to 10 months with the previous supplier’s products, reducing maintenance frequency by 50%.
User Value: Reduces downtime caused by insulation failure, lowers maintenance costs and labor input.
Data: ISO 9001 certified; 3-step strict inspection (raw material screening→in-production sampling→finished product testing); 100% pass rate of ASTM C177, C1275, and ISO 8890 tests; zero quality complaints in 5 consecutive years.
User Value: Stable product quality, avoids risks of insulation failure; meets international export standards, facilitating customs clearance for global projects.
Data: Lightweight (0.8-1.0 g/cm³), easy to cut with ordinary tools (hacksaw, chisel); installation time reduced by 40% compared to dense fire bricks; labor cost saved by 20-30%.
User Value: Shortens construction and retrofit periods; suitable for small-batch projects and on-site emergency repairs; no need for professional installation teams.
Choosing the correct heat-insulating bricks requires combining your working temperature, insulation needs, working environment, and budget. Follow these 4 steps to make the right decision:
Low Temperature (<1000℃): Suitable for laboratory furnaces, building fireplaces, small ovens. Recommend ceramic fiber heat-insulating bricks (λ=0.1-0.2 W/m·K) for maximum energy saving.
Medium Temperature (1000-1200℃): Suitable for ceramic kilns, industrial boilers, power plant auxiliary equipment. Recommend ultra-lightweight ceramic bubble bricks (balance of cost and performance).
High Temperature (1200-1400℃): Suitable for cement kilns, glass melting furnaces, steel hot blast stoves. Recommend alumina-silica heat-insulating bricks or high-alumina insulating bricks (Al₂O₃≥50%) for high-temperature stability.
Max Energy Saving (Non-Load-Bearing): Prioritize ultra-low thermal conductivity (0.1-0.2 W/m·K). Choose ceramic fiber heat-insulating bricks or ultra-lightweight ceramic bubble bricks.
Basic Insulation + Minor Load: Need moderate thermal conductivity (0.2-0.3 W/m·K) and mechanical strength. Choose alumina-silica heat-insulating bricks (compressive strength 5-7 MPa).
Harsh Environment (Wear/Slag): Prioritize high-alumina content (Al₂O₃≥50%) and wear resistance. Choose high-temp insulating bricks with good slag erosion resistance.
Humid Environment: Choose hydrophobic-treated heat-insulating bricks (surface coated with water-repellent material) to avoid moisture absorption affecting insulation performance.
Acidic Flue Gas: Choose silica-alumina heat-insulating bricks (acid-resistant composition) to prevent corrosion from acidic media.
High-Dust Environment: Choose bricks with moderate porosity (45-55%) to avoid dust accumulation blocking air pockets and reducing insulation efficiency.
Cost-Sensitive Projects: Choose ceramic fiber heat-insulating bricks (lowest cost, suitable for short-term or low-temperature use).
Long-Term ROI Focus: Choose alumina-silica heat-insulating bricks (longer service life, lower total cost of ownership over 2-3 years).
High-End Projects (Strict Standards): Choose high-temp insulating bricks (Al₂O₃≥50%) to meet strict high-temperature and stability requirements.
With 15+ years of experience in the refractory industry, we have become a trusted supplier of heat-insulating bricks for 500+ industrial customers in 40+ countries. Our strength, cases, and services ensure you get the best products and support.
• 15+ years of focus on refractory materials, specializing in heat-insulating bricks R&D and production.
• 2 production bases (total area 40,000㎡) with advanced equipment: automatic batching systems, high-temperature sintering kilns (max temp 1800℃), and precision testing instruments (ASTM-compliant).
• 30+ R&D engineers team, capable of customized product development based on unique working conditions.
Case 1: German Glass Factory – Purchased 1500 tons of high-temp heat-insulating bricks for glass melting furnace insulation layers. After 24 months of use, energy consumption was reduced by 30%, and the insulation layer showed no cracking or deformation. Annual cost savings: €62,000.
Case 2: Indian Cement Plant – Retrofitted 3 cement kiln cold faces with our alumina-silica heat-insulating bricks. Maintenance frequency decreased from 4 times/year to 2 times/year, maintenance cost reduced by 28%.
Customer Feedback: “The heat-insulating bricks have excellent performance, and the technical team provided professional installation guidance and after-sales support. We have extended our cooperation for 3 years.” – Mr. Schmidt, Technical Director of German Glass Factory
Pre-sales Service: Free technical assessment based on your working conditions (temperature, equipment, environment); customized product recommendations and insulation scheme design.
In-sales Service: Real-time production progress tracking (provide photos/videos); detailed quality inspection report (including ASTM test data) provided before delivery.
After-sales Service: 1-year quality guarantee (free replacement for defective products caused by quality issues); 24-hour technical support (solve installation and use problems); free sample available (you only bear shipping cost).
Minimum Order Quantity (MOQ): 100pcs (small-batch trial order acceptable for first-time customers).
Delivery Time: 7-15 days for in-stock heat-insulating bricks; 25-45 days for customized products (depends on quantity and specifications).
Payment Terms: T/T (30% deposit in advance, 70% against Bill of Lading); L/C (Letter of Credit) acceptable for large orders (>1000 tons).
Packaging & Shipping: Standard export wooden cases or pallets (moisture-proof and shock-proof); Shipping by sea (FOB/CIF terms); Ports: Qingdao/Shanghai, China. We can also arrange door-to-door delivery for you.
Q1: What’s the difference between heat-insulating bricks and ceramic fiber blankets?
A: Heat-insulating bricks are rigid and have better structural stability, suitable for flat or regular-shaped insulation layers (e.g., kiln walls). Ceramic fiber blankets are flexible, ideal for irregular surfaces (e.g., furnace corners, pipes). Bricks have longer service life (18-24 months) than blankets (12-18 months), while blankets are easier to install for complex shapes.
Q2: Can heat-insulating bricks be used in direct flame contact areas?
A: No. Heat-insulating bricks are designed for non-direct flame insulation layers. Direct flame contact will cause rapid oxidation and damage to the porous structure, reducing insulation performance and service life. For direct flame areas, use dense fire bricks (e.g., high-alumina bricks) as the front layer, with heat-insulating bricks behind them for insulation.
Q3: Do you provide installation guidance?
A: Yes! We provide free detailed installation manuals (with diagrams) for all customers. For large projects (>500 tons), we can send professional technical personnel for on-site installation guidance (additional cost applies). Our 24-hour technical hotline is also available to answer your installation questions.
Q4: How to store heat-insulating bricks correctly?
A: Store in a dry, well-ventilated warehouse with relative humidity <60%. Avoid direct sunlight, rain, or moisture; do not stack too high (max 5 layers) to prevent deformation. For hydrophobic-treated bricks, keep the packaging intact before use to avoid damaging the water-repellent layer.
Q5: Can you customize heat-insulating bricks with specific sizes or performance?
A: Yes! Our R&D team can customize size (any dimension), performance (thermal conductivity, temperature resistance), and packaging according to your specific working conditions. Provide us with your requirements, and we will complete the sample development within 7-10 days.
Main CTA: Get Your Free Quote & Technical Guide Now! – Fill in the form below, and our technical team will reply with a customized solution within 24 hours.
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