thermal preservation : heat insulation Calcium silicate board is asbestos free product.It isrecommended as thermal insulation in stove ,cave dwelling mill and some other heating equipment . The main sizes are 610*150mm ,600*300mm ,610*300mm and 1000*500mm Thinckness : 25-75mmMani characteristic : 1. High Strength : the strongest one among the inorganic thermal insulation materials with the similar density 2. Thermal -resistance : Non-deformation at the temperature used . 3. Thermal insulation: lower thermal conductivity than other hard mass thermal insulation material