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Low porosity clay octagonal brick
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 indicators of general purpose Clay brick:
|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:
|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)|