Refractory Brick

The main raw materials of refractory clay bricks are refractory clay and kaolin. Their chemical composition typically includes Al₂O₃ (30% – 40% by mass), SiO₂ (50% – 65% by mass), and small amounts of various metal oxides. Refractory clay bricks are weakly acidic refractory materials, with a load-softening point of approximately 1350°C. They have a low coefficient of thermal expansion, moderate thermal conductivity, good specific heat capacity and excellent thermal shock resistance. The maximum operating temperature is usually 1300-1400°C

Coke oven: used for doors, roofs and flues (non-critical components); It has poor resistance to alkali residue, but it is cost-effective.
Heating furnace: bottom and walls of the medium and low-temperature zone (e.g., average heating section).
Annealing furnace: lining and checkerboard bricks.
Rotary kiln preheater: Lining of cyclone separator and decomposer (resistant to slag rich in SiO₂).
Cooler: Square bricks used in low-temperature areas that require high thermal shock resistance.
Regenerative chamber: Square bricks resistant to acidic high-temperature gases (need to be replaced regularly).
Melted part of the chest wall: Suitable for areas that do not come into direct contact with molten glass.
Tunnel kiln: Kiln car deck and wall lining (resistant to erosion by volatile components).
Shuttle kiln: Used for fireplaces and flues.

Item	Specification
	PN-42	PN-40	PN-35
Al2O3  %	≥42	≥40	≥35
Fe2O3  %	≤2.0	≤2.0	≤2.5
Apparent Porosity  %	≤20	≤24	≤26
Bulk Density  g/cm3	2.1~2.25	2.05~2.2	1.95~2.1
CCS  MPa	≥45	≥35	≥30
0.2MPa RUL℃	≥1400	≥1350	≥1320
PLC  %	-0.4~0.11400℃×2h	-0.4~0.11350℃×2h	-0.4~0.11300℃×2h