Mullite insulation bricks not only provide excellent thermal insulation but also serve as a refractory material that can directly withstand high temperatures and exposure to flames. The FJM-23, FJM-26, FJM-28, and FJM-30 series of lightweight mullite insulating fire bricks feature low thermal conductivity, low heat fusion, and minimal impurities, offering high refractoriness and exceptional resistance to heat.
Mullite insulation bricks exhibit strong thermal shock stability and low thermal conductivity, making them highly effective in high-temperature shuttle kilns, ceramic roller kilns, and other industrial furnaces. The use of lightweight mullite insulation bricks helps companies significantly reduce energy consumption, lower production costs, and improve overall efficiency.
Lightweight mullite insulation bricks are widely used in various high-temperature equipment across industries such as metallurgy, chemical, and construction materials. These bricks are commonly applied in steel ladles, iron ladles, glass kilns, cement rotary kilns, cracking furnaces, tubular heating furnaces, reformers in the chemical industry, hot blast stoves, ladle insulation linings, shuttle and tunnel kilns, ceramic roller kilns, and pusher plate kilns, serving as refractory insulation materials in industrial furnaces.
As a lining material, lightweight mullite insulation bricks effectively protect equipment from high temperatures, acid and alkali corrosion, and material abrasion, thereby extending the service life of the equipment and reducing production costs. Additionally, these bricks provide excellent thermal insulation, minimizing heat loss and lowering energy consumption.
FJM23/FJM26/FJM28 in mullite insulation bricks represent different grades of brick numbers. Different grades of mullite insulation bricks will have different insulation performance, physical and chemical indicators and applicable scope.
① Different Al2O3 content The alumina content of mullite insulation bricks is 38-44%, 50-58% and 60-70% respectively. The higher the grade, the higher the alumina content, which affects the insulation performance and refractory temperature.
② Different refractory temperatures The refractory temperatures of the four grades of mullite bricks are 1260℃, 1430℃ and 1540℃ respectively. The higher the grade, the higher the refractory temperature. This is also the case with the increase of alumina content, the refractory temperature also increases, and the stability of mullite insulation bricks in high temperature environments is better.
③ Different volume density. The volume density of JM23 is 0.6g/cm3, while the volume density of JM26 and JM28 is the same at 0.8g/cm3;
④ Different compressive strength at room temperature. The compressive strength of mullite insulation bricks are 1.6Mpa, 2Mpa, and 3Mpa respectively. The higher the compressive strength at room temperature, the greater the load-bearing capacity and service life of the bricks.
FJM Series Insulating Firebrick | ||||||||||
Grade | Standard | Unit | FJM23L | FJM23 | FJM24 | FJM25 | FJM26 | FJM26-60 | FJM26H | |
Classification Group | ISO 2245 | 125-0.5-L | 125-0.6-L | 130-0.8 | 135-0.8-L | 140-0.8-L | 140-0.8-L | 140-0.9 | ||
ASTM C155 | 23 | 23 | 24 | 25 | 26 | 26 | 26 | |||
Classification Temperature | ℃ | 1260 | 1260 | 1300 | 1350 | 1430 | 1430 | 1430 | ||
Bulk Density | ASTM C134 | g/cm³ | 0.5 | 0.6 | 0.8 | 0.8 | 0.8 | 0.8 | 0.9 | |
Cold Crushing Strength | ASTM C133 | MPa | 1.2 | 1.6 | 2 | 2 | 2.5 | 2.4 | 2.8 | |
Modulus of Rupture | ASTM C133 | MPa | 0.7 | 0.9 | 1.2 | 1.2 | 1.4 | 1.3 | 1.5 | |
Permanent Linear | -0.3 | -0.2 | -0.5 | -0.5 | -0.4 | -0.2 | -0.2 | |||
Change Thermal | @ ℃×24h conductivity |
ASTM C210 | % | 1230 | 1230 | 1300 | 1350 | 1400 | 1400 | 1400 |
400℃ | ASTM C182 | W/m.K | 0.17 | 0.19 | 0.26 | 0.21 | 0.21 | 0.23 | 0.3 | |
600℃ | 0.19 | 0.23 | 0.28 | 0.27 | 0.27 | 0.28 | 0.32 | |||
800℃ | 0.22 | 0.24 | 0.3 | 0.3 | 0.3 | 0.31 | 0.35 | |||
1000℃ | 0.24 | 0.25 | 0.34 | 0.32 | 0.32 | 0.33 | 0.38 | |||
1200℃ | — | — | — | — | 0.35 | 0.36 | 0.39 | |||
Chemical Composition | ||||||||||
Al2O3 | % | 42 | 42 | 45 | 50 | 55 | 60 | 55 | ||
SiO2 | 54 | 54 | 48 | 46 | 41.5 | 37 | 41.5 | |||
Fe2O3 | 0.8 | 0.8 | 1 | 0.9 | 0.8 | 0.7 | 0.8 | |||
TiO2 | 1.2 | 1.2 | 1.2 | 1.3 | 1 | 0.7 | 1 | |||
Cao+MgO | 0.7 | 0.7 | 0.7 | 0.7 | 0.7 | 0.5 | 0.7 | |||
Na2O+K2O | 1.3 | 1.3 | 1.2 | 1.1 | 1 | 1.2 | 1 |