Properties of JIS series insulating bricks Items Products Temp. of linear change less than 2% after reheating Bulk Density g/cm3 max C.C. Strength kgf/cm3minThermalConductivityw/m.k , 350maxGrade A A 1 9000.5050.13A 2 10000.5050.14A 3 11000.5050.15A 4 12000.5580.16A 5 13000.6080.17A 6 14000.70100.20A 7 15000.75100.22Grade B B 1 9000.70250.17B 2 10000.70250.18B 3 11000.75250.20B 4 12000.80250.22B 5 13000.80250.23B 6 14000.90300.27B 7 15001.00300.31 Grade C C 1 13001.10500.30C 2 14001.20700.38C 3 15001.251000.45