Product Overview:
Clay brick is made from hard clay, cokestone and binder through granulation and powder making processes, mixed in a certain proportion, then pressed into shape and calcined at high temperature. Clay Fire-resistant brick is divided into professional-use Clay bricks (including Clay bricks for blast furnaces, Clay bricks for glass kilns, Clay bricks for hot blast stoves) and general-use Clay bricks according to their uses.
General purpose Clay brick is divided into three grades PN-1, PN-2 and PN-3 according to the physical and chemical indicators.
Clay brick for professional use is divided into three grades ZN-45, ZN-40 and ZN-36 according to physical and chemical indicators.
Physical and chemical indexes of general clay bricks：
| Item | Indicator | ||
| PN-1 | PN-2 | PN-3 | |
| 0.2MPaLoad softening start temperature ℃ ≥ | 1300 | 1250 | 1200 |
| Heating permanent line change(1350℃×2h) % | -0.2～+0.1 | -0.3～+0.1 | -0.4～+0.1 |
| Apparent porosity % ≤ | 24 | 26 | 28 |
| Compressive strength at room temperature Mpa ≥ | 30 | 25 | 20 |
Physical and chemical indicators of professional use Clay brick:
| Item | Indicator | ||
| ZN-45 | ZN-40 | ZN-36 | |
| Al2O3 % ≥ | 45 | 40 | 36 |
| 0.2MPaLoad softening start temperature ℃ ≥ | 1430 | 1380 | 1350 |
| Heating permanent line change(1400℃×2h) % | -0.2～+0.1 | -0.3～+0.1 | -0.4～+0.1 |
| Bulk Density g/cm³ | 2.0～2.3 | ||
| Apparent porosity % ≤ | 16 | 19(22) | 22(24) |
| Compressive strength at room temperature Mpa ≥ | 60 | 40(35) | 35(30) |