Vermiculite slabs | VIREboard


1100 ° C KFT






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Technically excellent and cost-oriented solution.


Light, non-toxic, fiber-free, odorless and acid-resistant.


Depending on the product variation, application temperatures up to 1100 ° C.


Our VIREboard vermiculite boards with a density of 475-700 kg / m³ and a maximum application temperature of 1,100 C are often used in stoves and boilers. Due to their good mechanical strength, the panels are also suitable for lining the combustion chamber and insulating doors and lids.

Vermiculite panels are also used in the aluminum industry (also suitable for direct contact with aluminum) and the steel industry. Vermiculite sheets can be processed into different shapes. This is done exactly according to customer requirements and specifications.


  • different densities depending on the application
  • unclassified material
  • Cost efficient
  • Technically excellent
  • Light
  • Nontoxic
  • Fiber free
  • Odorless
  • Acid resistant
  • Refractory

KS Kneissl & Senn Technologie

KS Kneissl & Senn Technologie GmbH has been producing insulation materials and seals for a wide variety of applications up to a temperature range of 1600 ° C since 2001. A diverse machine park (CNC 5-axis milling, plotting, punching, sewing, water jets, vacuum forming, etc.) enables us to do a variety of things Materials in shape for you bring to. The main materials include materials such as: glass fibers, Aramid fibers, mineral fibers, Biosoluble fibers, Ceramic fibers, silicate fibers, Vermiculite, Calcium silicate, Microporous materials, Rubber Material (Rubber, silicone, Silicone sponge, etc.), etc.

The company has been certified according to ISO9001 since 2009, currently according to the 2015 standard revision.

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Product variations


Pressed parts

Vermiculite Vermiculite Vermiculite Sheets Products Fireproof KS Kneissl Senn Technologie GmbH 2

CNC milled parts


Physical Properties

Colour: sand
Application limit temperature (° C): 1100
Melting point (° C): > 1300
Volume weight: 400 kg / m3
475 kg / m3
600 kg / m3
700 kg / m3
Standard panel thickness tolerance +/- 1 mm
Standard length / width tolerance +/- 2.5 mm
Tolerances for molded parts (pressed) DIN ISO 2768-m
Cold compressive strength 4.5 N / mm²
Flexural strength 2.0 N / mm²
Specific heat capacity 940 J / kgK


Permanent linear shrinkage (%) after 24 hours
1000 ° C: 1,0

Chemical Analysis 

SiO2: 46,0%
TiO2: 0,7%
Fe2O3: 5,5%
Al2O3: 7,0%
MgO: 19,0%
CaO: 3,5%
Na2O: 0,2%
K2O: 10,0%

Thermal conductivity

24 ° C 0.13 W / mK
200 ° C 0.19 W / mK
400 ° C 0.20 W / mK
600 ° C 0.21 W / mK
800 ° C 0.22 W / mK
1000 ° C 0.24 W / mK



Datasheet Vireboard VB1100-400

Product properties, typical applications and availabilities.

Datasheet Vireboard VB1100-475

Product properties, typical applications and availabilities.

Datasheet Vireboard VB1100-600

Product properties, typical applications and availabilities.

Datasheet Vireboard VB1100-700

Product properties, typical applications and availabilities.

KS Technologie product catalog

Refractory | Seals | Foundry supplies | Conveyor chains | Chesterton

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