
Clay bricks are manufactured primarily from high-quality feldspar or hard-baked clay clinker, formed under high pressure and sintered at high temperatures. These products are characterized by high strength, excellent thermal shock resistance, and superior thermal insulation properties, making them one of the most widely used basic refractory materials in the masonry of glass melting furnaces.
Key Features:
Excellent Thermal Shock Resistance: Clay bricks have a low coefficient of thermal expansion and excellent resistance to rapid temperature changes. They can withstand the frequent temperature fluctuations in the regenerative chamber of a melting furnace without cracking or spalling.
Superior Thermal Insulation: Their low bulk density and thermal conductivity make clay bricks an ideal material for furnace linings and insulation layers, effectively reducing heat loss and improving the thermal efficiency of the melting furnace.
High-Temperature Structural Strength: They maintain stable volume and strength at long-term operating temperatures (approximately 1200–1300°C), making them reliable for both load-bearing and thermal insulation applications.
Chemical Stability: They exhibit good resistance to both acidic and alkaline atmospheres and can be used in areas exposed to combustion gases and dust within the furnace.
Cost-effective and practical: With widely available raw materials and low production costs, these bricks offer exceptional value for money as basic construction materials in glass melting furnace projects. They are suitable for extensive use in flue ducts, regenerators, and chimney linings.
Applications:
Regulate grids, walls, flue ducts, chimneys, insulation backing for furnace bottoms, furnace door arches, and auxiliary areas not in contact with molten glass in glass melting furnaces. Widely used in the construction of float glass, bottle and jar, tableware, and specialty glass melting furnaces.

| Projects | Physical and chemical indicators | |||||
| PN-42 | PN-40 | PN-35 | PN-30 | PN-25 | ||
| (Al₂O₃)/% | ≥ | 42 | 40 | 35 | 30 | 25 |
| (Fe₂O₃)/% | ≤ | 2.0 | / | / | / | / |
| Apparent porosity/% | ≤ | 20 | 24 | 26 | 23 | 21 |
| Compressive strength at room temperature/Mpa | ≥ | 45 | 35 | 30 | 30 | 30 |
| 0.2Mpa load softening temperature T0.6/℃ | ≥ | 1400 | 1350 | 1320 | 1300 | 1250 |
| Heating Permanent Line Change % | U-L | 1400℃×2h -0.4~0.1 | 1350℃×2h -0.4~0.1 | 1300℃×2h -0.4~0.1 | 1250℃×2h -0.4~0.1 | 1200℃×2h -0.4~0.1 |