Ceramic Fiber Blankets is a fibrous lightweight refractory material, which is mainly made of aluminum silicate, silicon dioxide, alumina, zirconium oxide and other materials, and is suitable for various high-temperature, high-pressure, and non-wear environments.
(1) Excellent thermal insulation performance
(2) Excellent thermal stability: the fiber has good resistance to devitrification
(3) Low heat storage
(4) Tough, elastic and strong blanket,
(5) Not easy to tear before and after heating
(6) Thermal shock resistance
(7) Good acoustic properties
(1) Power generation, especially heat recovery boiler pipe insulation
(2) Industrial and commercial chimney insulation
(3) Furnace, boiler and heater linings
(4) Pipe wrapping
(5) Backup linings for kilns and furnaces
(6) Consumer products
(7) Heat storage insulation
Thermal conductivity (k-value) is a material property that indicates how efficiently heat is transferred through a material, typically measured in W/m·K.
For ceramic fiber blankets, low thermal conductivity means:
In industrial thermal insulation, thermal conductivity is one of the most critical performance indicators, alongside classification temperature and bulk density.
In high-temperature equipment such as furnaces, kilns, and boilers, ceramic fiber blankets are used as lining or backup insulation.
Lower thermal conductivity helps to:
Choosing the correct thermal conductivity grade directly impacts long-term operating costs, not just initial material price.
Thermal conductivity values are typically measured according to international standards, such as:
Testing is conducted at specific mean temperatures (e.g. 400°C, 600°C, 800°C), because thermal conductivity increases as temperature rises.
⚠️ Important: Thermal conductivity values at room temperature are not representative of real furnace conditions.
Below are typical reference values for ceramic fiber blankets with a bulk density of 128 kg/m³:
| Mean Temperature (°C) | Thermal Conductivity (W/m·K) |
|---|---|
| 400°C | 0.10 – 0.12 |
| 600°C | 0.13 – 0.15 |
| 800°C | 0.16 – 0.18 |
| 1000°C | 0.20 – 0.23 |
Actual values may vary depending on fiber composition, shot content, and manufacturing process.
Different ceramic fiber blanket grades exhibit different thermal behaviors:
Higher classification temperature generally provides better thermal stability, but selection should always be based on actual operating temperature, not maximum rating alone.
Several factors influence the thermal conductivity of ceramic fiber blankets:
Higher density usually leads to:
Thermal conductivity increases with temperature, which is why values must be evaluated at service conditions.
High-purity alumina fibers offer:
Lower shot content improves:
Ceramic fiber blankets with optimized thermal conductivity are widely used in:
Correct selection ensures optimal insulation performance and energy efficiency.
When selecting a ceramic fiber blanket, consider:
✔ Maximum continuous operating temperature
✔ Required thermal conductivity at service temperature
✔ Bulk density and thickness
✔ Installation method (lining, backup insulation, expansion joints)
If you are unsure, providing furnace temperature, structure, and insulation layer design allows us to recommend the most suitable grade.
Custom grades and dimensions are available based on project requirements.
Q1: Does higher density always mean lower thermal conductivity?
Not necessarily. Higher density improves performance at high temperatures but may increase conductivity at lower temperatures.
Q2: Can ceramic fiber blanket thermal conductivity be reduced by increasing thickness?
Increasing thickness reduces total heat loss but does not change the material’s intrinsic thermal conductivity.
Q3: Which thermal conductivity value should I use for design calculations?
Always use values measured at your actual operating temperature, not room-temperature data.
If you need:
👉 Contact our technical team for professional assistance.
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