Insulfrax® 1300 HT | Alkaline earth silicate fibre mats


1300 ° C KFT


Earth alkaline silicate fiber


Mat (blanket)


SKU: N/A Category:

Insulation properties

Exceptional insulation properties.


Temperature resistance

High temperature resistance up to 1300 ° C.


Temperature change

High resistance to temperature changes.


Insulfrax® 1300 HT mats represent the next generation of LBP high-temperature wool insulation materials (Low Bio Persistent) from Unifrax. This new innovative product combines excellent thermal insulation with increased application temperature. The needled Insulfrax 1300 HT mat is manufactured using our unique know-how in proven technology and offers both a classification temperature of 1300 ° C and an application limit temperature of 1200 ° C. Insulfrax 1300 HT mats are made from alkaline earth silicate wool (AES) and can be effective solutions for a variety of applications over a wide range of temperatures. Insulfrax 1300 HT mats are completely inorganic, binder-free and therefore retain their strength, flexibility and thermal properties in numerous applications without any occurrence of smoke or steam.


  • High temperature resistance (up to 1300 ° C)
  • Low thermal conductivity
  • Good thermal shock resistance
  • High tensile strength and elasticity
  • Light weight
  • Excellent flexibility
  • Low heat storage


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: 72,0 – 78,0
CaO + MgO: 21,0 – 27,0
Other oxides:  <3.0


Physical Properties
Colour: White
Classification temperature (° C): * 1300
Application limit temperature (° C): 1200
Mean fiber diameter (μm) 3,6


Permanent linear shrinkage (%) after 24 hours
1300 ° C: 3,4
Volume weight (kg / m³) 96 128 160
Thermal conductivity (W / mK)
200 ° C 0,07 0,06 0,06
400 ° C 0,11 0,10 0,09
600 ° C 0,17 0,16 0,15
800 ° C 0,26 0,23 0,21
1000 ° C 0,36 0,31 0,29
1200 ° C 0,56 0,49 0,45
Tensile strength (kPa) 44 58 62



Datasheet Insulfrax® 1300 HT

Product properties, typical applications and availabilities.


KS Technologie product catalog

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