... of low density, light, heat preservation, heat insulation, good fire resistance 1.Refractory castable ceramsitea.performances of low ... select of big ones.3.High strength refractory castable ceramsiteHigh strength refractory castable ceramsite is the combination of shale ... water are light ceramsite or will be called heavy ceramsite. Metallurgical Furnace Fire-resistant Ceramsite(light weight aggregate)