The skamolex sheeting in the combustion chamber is made of vermiculite, which is a specially designed material that can withstand heat and insulate efficiently. Both optimal temperature and combustion in the combustion chamber are thereby ensured.
The material is porous, and it cannot withstand jolts or blows.
Cracks are most often caused by the material being struck by a piece of firewood or the like. However, the material's insulating effect is not adversely affected as long as the sheeting remains properly positioned in the stove.
The sheeting should be replaced when it is worn down to approximately half its original thickness. Otherwise, it will no longer insulate optimally, and it is therefore not able to ensure the proper combustion temperature, nor is it able to protect the wood-burning stove against the high temperatures in the combustion chamber.