SILICA BRICKS FOR HOT BLAST FURNACEÂ
| ITEM | crown bricks | checker bricks |
| SiO2 % | ≥95 | ≥95 |
| AP,  % | ≤22 | ≤23 |
| CCS, Mpa | ≥35 | ≥30 |
| Real density, g/cc | ≥2.35 | ≥2.35 |
| Creep rate under 0.2MPa,1500℃*5hrs, % | ≤0.8 | ≤0.8 |
| Thermal expension at 1000℃,   % | ≤1.26 | ≤1.26 |