Product Overview
Our LZ-55 High Alumina Bricks are premium-quality, shaped refractory products specifically engineered for glass furnace applications. The “LZ-55” designation follows the Chinese National Standard classification, where “LZ” stands for “high alumina brick” , and “55” indicates a nominal alumina (Al₂O₃) content of ≥55% .
Manufactured from selected high-quality bauxite as the primary raw material, LZ-55 bricks undergo a rigorous production process including batching, mixing, high-pressure forming, and sintering at controlled temperatures of 1360-1480°C in tunnel kilns . This process results in products with accurate dimensions, consistent quality, and optimized microstructure featuring corundum and mullite as the main mineral phases .
As a chemically neutral refractory with 55% Al₂O₃ content, LZ-55 bricks occupy the mid-range of the standard high alumina brick family, offering an excellent balance of performance and cost-effectiveness for glass furnace applications where resistance to both acidic and alkaline environments is required .
Key Features & Benefits for Glass Industry
-
High Refractoriness for Glass Furnace Conditions: LZ-55 bricks offer excellent heat resistance with a refractoriness of ≥1770°C, making them suitable for the demanding high-temperature environments of glass melting furnaces .
-
Superior Load-Bearing Capacity at Operating Temperatures: With a refractoriness under load (0.2MPa) of ≥1450°C, these bricks maintain structural integrity under both thermal and mechanical stress in glass furnace superstructures .
-
Excellent Resistance to Glass Batch Attack: As a chemically neutral refractory, LZ-55 provides strong resistance to corrosion by both acidic and alkaline components present in glass batch materials and furnace atmospheres .
-
Good Thermal Shock Resistance: High alumina bricks offer reliable performance under fluctuating temperatures, making them suitable for glass furnace cycling conditions .
-
Volume Stability at Operating Temperatures: Controlled permanent linear change (0 to -0.4% at 1500°C×2h) ensures dimensional stability during the furnace campaign, maintaining tight joints and structural integrity .
-
High Mechanical Strength: Cold crushing strength of ≥40-46 MPa ensures durability during transport, installation, and throughout the service life .
Applications in Glass Industry
LZ-55 high alumina bricks are specifically engineered for various critical zones of glass melting furnaces:
Glass Furnace Applications:
-
Glass Furnace Superstructures: Upper walls, breast walls, and regenerator crowns where temperatures are high and alkaline vapor exposure is present .
-
Regenerator Chambers: Checker bricks and chamber linings for heat recovery systems, where thermal cycling and chemical attack require durable materials .
-
Port Arches and Port Necks: Flame port structures directing combustion gases into the melting chamber .
-
Doghouse Areas: Batch inlet regions subject to thermal shock and mechanical abrasion from raw materials .
-
Suspended Walls and Inlet Sealing Areas: General superstructure applications requiring reliable performance at elevated temperatures .
-
Glass Furnace Bottoms: Working lining and permanent layer applications .
-
Burner Blocks: Areas subject to direct flame impingement and high thermal stress .
Other Glass-Related Applications:
-
Glass Tank Forehearths: Channels and distributor blocks for molten glass distribution .
-
Glass Annealing Lehrs: Structural components where thermal stability is required.
-
Specialty Glass Furnaces: For borosilicate, aluminosilicate, and other specialty glass compositions where controlled refractory properties are essential.
Why Choose Our LZ-55 High Alumina Bricks for Glass Furnaces?
Our LZ-55 high alumina bricks are manufactured specifically with glass industry requirements in mind:
Manufacturing Excellence:
-
Raw materials undergo grading, sorting, and magnetic separation to remove impurities that could affect glass quality .
-
High-pressure forming ensures uniform density and accurate dimensions for tight joint construction .
-
Controlled firing in tunnel kilns ensures complete phase transformation and consistent quality .
-
100% dimensional inspection before packaging ensures proper fit during installation.
Glass Industry Quality Assurance:
-
Chemical composition verified by XRF analysis to ensure Al₂O₃ ≥55% and Fe₂O₃ within specification .
-
Physical properties tested per ASTM/GB standards to ensure reliable performance.
-
Low iron content minimizes risk of glass defects from refractory contamination .
-
Thermal shock resistance testing available upon request for specific glass furnace applications .
For Inquiries:
Contact our glass industry specialists for application engineering support, custom sizing, or to discuss which high alumina brick grade is optimal for your specific glass furnace design and operating conditions. We provide detailed technical data sheets, shop drawings, and certification documents with every order.
