The company Grena, Inc., was the first in the Czech republic to start manifacture of refractory and insulation materials from vermiculite.


The materials which are mainly used in the industry for insulation of heat installation are expanded heat-insulating fire-resistant materials which are easily machined, are highly insulating, are thermal shock resistant and highly imperishable. These materials include the boards made from vermiculite.

Fire-resistant boards Grenamat AS designed for the inner panelling board in stoves, wood burning stoves, fireplaces and others successfully compensate fire-clay linings from several reasons

- new construction of heating devices requires higher temperature of combustion and thus reduction of emissions. Nowadays producers are not satisfied only with wood ´burning´but they use hot gas with a multiple grade of combustion (2 or 3 times) which leads to higher temperatures of combustion, lower emissions and obviously to fuel savings. These constructions prefer vermiculite boards which enable higher temperatures of combustion without a risk of damaging of heating device or furnace.

  • vermiculite boards are light, density 450 – 900 kg/m3 and it leads to delivery savings in comparison with refractory concrete or fire-clay.

  • vermiculite boards can be machined by common wood-working tools so it is possible to change them or adjust them without any necessity to make special forms for products.

- vermiculite is basically an expanded mineral which is ecological, does not represent any health hazard and does not release any vapours even at high temperatures.

  • vermiculite is fire-resistant up to 1300 °C

Grenaisol insulation boards are designed for insulation of all heat sources. They are mainly used for fireplace shells and wall insulation behind a heat source (walls, ceiling and wall ducts, etc.).

For these properties vermiculite is more and more often preferred to high volume materials which are heavy with a difficult technique of machining.




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