... Apparent porosity, %2223- Refractoriness, oC, >1,7501,650- Permanent change in 2 hours, oC, %0.31,3500.61,300- Compressive strength ... , Mpa, ≥3530- Thermal conductivity, Tm = 350oC, ≤0.414-- Bulk density, g/cm3, ≥21.95- Refractoriness under load ... 2kg/cm3 (oC), ≥1,4001,300- Thermal resistance (950oC), air, time, ≥3030Features and ...