Feature: non-toxic, tasteless, acidproof, alkaliproof, perfect heat and sound insulation properties. ElementsSiO2Al2O3K2ONa2OCaOMgOContent 69 - 72% 12 - 18%3 - 4.5% 3 - 4.5% 0.1 - 0.2% 0.2 - 0.5% Name of IndexBulk DensityHeat ConductivityWater ContentOperating TemperatureDiameterIndex60 - 93kg/m3 0.055w/m<2% -256 - 800°c 0.15 - 8mmApplication: mainly used for industries of construction, ...