Fiberfrax Durablanket® Z | Ceramic Fiber Mats


1400 ° C KFT


Ceramic fiber | Aluminum silicate wool


Mat (blanket)



SKU: N/A Category:


Excellent handling / processing strength.


Heat resistance

Resistance to temperature changes & resistance to chemicals.



Low thermal conductivity & heat storage.


Durablanket® ASW high-temperature wool insulation materials are firmly needled insulation mats made from spun Fiberfrax ASW high-temperature wool. The extra long spun high-temperature insulating wool, which is needled crosswise in a unique manufacturing process, creates a mat of exceptional strength for better handling / processing. Fiberfrax Durablanket® S insulation mats are based on fibers made of aluminum silicate wool / refractory ceramic fiber (ASW / RCF) and are characterized by a temperature resistance of up to 1260 ° C.


  • Low thermal conductivity & heat storage
  • High tensile strength & elasticity
  • Thermal shock resistance & durability
        to chemicals
  • Good sound absorption


Mats (blankets) made of high temperature wool are needled lightweight mats made of ceramic (ASW/RCF) high temperature wool (HTW) and provide an effective solution for a wide range of thermal insulation applications. They are characterized by excellent insulating properties, high resistance to chemicals, elasticity and dimensional stability. They are exclusively inorganic and therefore do not generate smoke or fumes when exposed to heat. They are available in a wide range of densities and thickness combinations, making them one of the most versatile product groups on the market.


High temperature wool made of ceramic fibers, also known as ASW (aluminum silicate wool) or RCF (Refractory Ceramic Fiber), have been used for years as the standard fiber type for insulation solutions up to 1260 ° C. Consisting of a mix of aluminum oxide (Al2O3) and silica (SiO 2)2), the fibers offer not only high temperature resistance but also good chemical and mechanical properties.

By further refining the fiber with zirconium oxide (ZiO2), a temperature resistance of up to 1400 ° C can be achieved.


Unifrax® is one of the world's leading manufacturers of high-performance specialty fibers and inorganic materials that are used in industry, the automotive sector and fire protection. Our goals, philosophy and values build on our efforts to manufacture high quality products that help our customers save energy, reduce pollution and improve fire protection.

Product variations


Roll goods

Fiber mats are sold as roll goods as standard. The roll length depends on the selected thickness. As a standard width, we have 610mm wide rolls from stock. Double widths are available on request.



We manufacture molded parts according to your specifications. The roll goods are made using

  • Water jet
  • Punching
  • Plotting

brought into the right shape for you.


Fiber modules

We manufacture fiber modules according to customer specifications that are designed for the insulation requirements of industrial ovens, kilns and heating devices.


Chemical Analysis 
SiO2: 52,0 – 56,0
Al2O3: 28,0 – 32,0
ZrO2: 14,0 – 18,0
Alkalis: <0.25
Fe2O3 + TiO2:  <0.2


Physical Properties
Colour: White
Classification temperature (° C): * 1400
Melting point (° C): 1740
Mean fiber diameter (My): 3,25
Specific heat at 1000 ° C (J / kgK): 1035


Permanent linear shrinkage (%) after 24 hours
1400 ° C: 2,7
Volume weight (kg / m³) 96 128 160
Thermal conductivity (W / mK)
Average temperature
800 ° C 0,24 0,19 0,18
1000 ° C 0,34 0,27 0,25
1200 ° C 0,44 0,36 0,33
Tensile strength (kPa) 70 90 110



Datasheet Fiberfrax® Durablanket® Z

Product properties, typical applications and availabilities.


KS Technologie product catalog

Refractory | Seals | Foundry supplies | Conveyor chains | Chesterton

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