Items Bricks Reheat Shrinkage ≤2% Test Temperature   °C Bulk Density (g/cm3) ±0.05 Cold Crushing Strength (Mpa) ≥ Coefficient of Thermal Conductivity (w/m.k) (at 350°C ) ≤ Fe2O3%  ≤ Al2O3% ≥   A     A-5 1300 0.60 0.8 0.17 2 38   A-6 1400 0.70 1.0 0.20 2 38   A-7 1500 0.75 1.0 0.22 2 38   B     B-1 900 0.70 2.5 0.17 2 38   B-2 1000 0.70 2.5 0.20 2 38   B-3 1100 0.75 2.5 0.22 2 38   B-4 1200 0.80 2.5 0.23 2 38   B-5 1300 0.80 2.5 0.23 2 38   B-6 1400 0.90 3.0 0.27 2 45   B-7 1500 1.00 3.0 0.31