Insulfrax® LTX™ (S) | Alkaline earth silicate fibre mats


1200 ° C KFT


Earth alkaline silicate fiber


Mat (blanket)


SKU: N/A Category:

Insulation properties

Exceptional insulation properties.

Temperature resistance

High temperature resistance up to 1200 ° C.

Temperature change

High resistance to temperature changes.


Insulfrax ® LTX ™ | Insulfrax ® S mats are the latest addition to the Insulfrax mat range. Insulfrax® LTX ™ offers the same benefits of previous Insulfrax versions, now with enhanced physical properties that increase both thermal efficiency and handling. These needled mats combine our unique know-how with proven technology to create the best Insulfrax mat with low bio-persistence currently available from Unifrax. The Insulfrax® LTX ™ mats are made from alkaline earth silicate wool (AES wool).


  • Exceptional insulation properties
  • High temperature resistance (up to 1200 ° C)
  • Resistance to temperature changes
  • High tensile strength & elasticity
  • Lightweight
  • Excellent flexibility
  • Good sound insulation


Mats (blankets) made of high temperature wool are needled lightweight mats made of biosoluble (AES) 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.


Alkaline earth silicate fiber high temperature wool (AES Alkaline Earth Silicate Wool) consist of a mix of amorphous fibers, which are melted and then rapidly solidified using a combination of silica SiO2 and calcium oxide (CaO) with or without magnesium oxide (MgO). The fiber can be obtained by refining with other additives or a change in the material mix (addition of zirconium oxide (ZrO2) have a temperature resistance of up to 1260 ° C.


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: 61,0 – 67,0
CaO: 27,0 – 33,0
MgO: 2,5 – 6,5
Al2O3 <1.0
Fe2O3  <0.6


Physical Properties
Colour: White
Classification temperature (° C): * 1200
Application limit temperature (° C): 1100
Melting point (° C): 1100
Mean fiber diameter (μm) 4,0


Permanent linear shrinkage (%) after 24 hours
1200 ° C: 1,0
Volume weight (kg / m³) 64 96 128 160
Thermal conductivity (W / mK)
200 ° C 0,06 0,06 0,05 0,05
400 ° C 0,11 0,09 0,08 0,08
600 ° C 0,17 0,14 0,12 0,11
800 ° C 0,26 0,20 0,18 0,15
1000 ° C 0,38 0,29 0,25 0,21
Tensile strength (kPa) 45 65 85 100



Insulfrax® LTX ™ data sheet

Product properties, typical applications and availabilities.

KS Technologie product catalog

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