In many furnaces, insulation layers are the weakest link:
Diatomite bricks are lightweight but absorb moisture easily and degrade fast.
Perlite bricks tend to powder and lose strength under thermal cycling.
Conventional floating bead bricks lack dimensional stability for precision masonry.
The KN series was developed to address these issues. By combining low thermal conductivity, higher compressive strength, and stable PLC, it ensures a longer-lasting insulation layer. The result: reduced heat loss, less frequent relining, and lower total energy consumption for users.
For even lower thermal conductivity, you may also consider our Microporous Insulation Board.
The KN insulation brick is suitable across multiple industries where backup insulation is critical:
Steel & Metallurgy: Furnace walls and ladle backup layers, reducing shell heat loss.
Ceramics & Glass: Shuttle kilns, tunnel kilns, and glass furnaces requiring stable lightweight lining.
Non-Ferrous Metallurgy (Aluminum, Copper, etc.): Backup insulation for melting and holding furnaces, improving energy efficiency.
Petrochemical & Power Plants: Used in heaters, reformers, and boilers to reduce energy consumption.
By replacing traditional insulation bricks, KN helps users cut energy bills, extend lining service life, and achieve more predictable maintenance schedules.
In hot-face zones, KN is often combined with Ceramic Fiber Blankets for optimal lining performance.
1: Why should I choose KN over diatomite or perlite insulation bricks?
KN bricks provide lower thermal conductivity, higher strength, and greater durability, resulting in lower long-term operating costs.
2: Can KN be used as working lining in direct contact with flame?
No, KN is designed mainly for backup insulation. For hot-face applications, it should be combined with dense or high-alumina refractory bricks.
3: How does KN improve furnace efficiency?
By reducing heat loss through the furnace wall, KN bricks lower fuel consumption and stabilize furnace shell temperatures, helping operators save on energy bills and maintenance costs.
4: Is installation different from conventional insulation bricks?
No. Thanks to precise dimensional control, KN bricks can be laid with standard refractory mortars, ensuring tight joints and minimal gaps.
5: Which industries benefit the most from KN insulation bricks?
Steel, ceramics, non-ferrous metallurgy, glass, cement, and petrochemical sectors — basically any industry where energy savings and stable insulation performance are key.
| KN Cost-Effective Floating Bead Insulation Brick | |||
| Grade | KN06 | KN08 | KN10 |
| Classification Temperature | 1100℃ | 1100℃ | 1100℃ |
| Color | Grey | Grey | Grey |
| Bulk Density | 0.6g/cm3 | 0.8g/cm3 | 1.0g/cm3 |
| -0.05g/cm3 ~+0.05g/cm3 | |||
| Cold Crushing Strength | ≥2.0 MPa | ≥3.0 MPa | ≥4.0 MPa |
| Permanent Linear Change | ±1% (1050 ℃x6h) |
±1% (1050 ℃x6h) |
±1% (1050 ℃x6h) |
| Thermal Conductivity， W/m•K | |||
| 400℃ | 0.15 | 0.22 | 0.24 |
| 600℃ | 0.2 | 0.27 | 0.28 |
| 800℃ | 0.26 | 0.31 | 0.32 |
| Chemical Composition | |||
| SiO2 | 60% | 60% | 60% |
| Al2O3 | 30% | 30% | 30% |
| Fe₂O₃ | 3% | 3% | 3% |
