Thermal Insulation MaterialsInsulating bricks
Mullite Insulation Brick
Mullite insulating brick that can be exposed directly to flame, combining light weight, high strength, low thermal conductivity and good thermal shock resistance. Grades JM23 to JM32.
- Grades / types
- 7 grades, JM23 to JM32
- Specification tables
- 2: Grades JM23 to JM27; Grades JM28 to JM32
Product overview
Mullite insulation brick has a high refractoriness and can be exposed directly to flame. It is light, has high strength and low thermal conductivity, good thermal shock resistance and a significant energy-saving effect.
Key characteristics
- High refractoriness, suitable for direct flame contact
- Light weight
- High strength
- Low thermal conductivity
- Good thermal shock resistance
Technical data
| Property | Unit | JM23 | JM25 | JM26 | JM27 |
|---|---|---|---|---|---|
| Al₂O₃ | % | ≥40 | ≥50 | ≥55 | ≥60 |
| Fe₂O₃ | % | ≤1.0 | ≤1.0 | ≤0.9 | ≤0.8 |
| Bulk Density | g/cm³ | ≤0.55 | ≤0.80 | ≤0.85 | ≤0.9 |
| Cold Crushing Strength (CCS) | MPa | ≥1.0 | ≥1.5 | ≥2.0 | ≥2.5 |
| Permanent Linear Change (PLC) | % | -1.5~0.5 (1230℃×12h) | -1.5~0.5 (1350℃×12h) | -1.5~0.5 (1400℃×12h) | -1.5~0.5 (1450℃×12h) |
| Thermal Conductivity (200±25℃) | W/(m·K) | ≤0.18 | ≤0.26 | ≤0.28 | ≤0.32 |
| Thermal Conductivity (350±25℃) | W/(m·K) | ≤0.20 | ≤0.28 | ≤0.30 | ≤0.32 |
| Thermal Conductivity (600±25℃) | W/(m·K) | ≤0.22 | ≤0.30 | ≤0.33 | ≤0.36 |
| Refractoriness Under Load, 0.05 MPa (RUL) (T0.5) | ℃ | ≥1080 | ≥1200 | ≥1250 | ≥1300 |
| Property | Unit | JM28 | JM30 | JM32 |
|---|---|---|---|---|
| Al₂O₃ | % | ≥65 | ≥70 | ≥77 |
| Fe₂O₃ | % | ≤0.7 | ≤0.6 | ≤0.5 |
| Bulk Density | g/cm³ | ≤0.95 | ≤1.05 | ≤1.35 |
| Cold Crushing Strength (CCS) | MPa | ≥2.5 | ≥3.0 | ≥3.5 |
| Permanent Linear Change (PLC) | % | -1.5~0.5 (1510℃×12h) | -1.5~0.5 (1620℃×12h) | -1.5~0.5 (1730℃×12h) |
| Thermal Conductivity (200±25℃) | W/(m·K) | ≤0.35 | ≤0.42 | ≤0.56 |
| Thermal Conductivity (350±25℃) | W/(m·K) | ≤0.37 | ≤0.44 | ≤0.60 |
| Thermal Conductivity (600±25℃) | W/(m·K) | ≤0.39 | ≤0.46 | ≤0.64 |
| Refractoriness Under Load, 0.05 MPa (RUL) (T0.5) | ℃ | ≥1360 | ≥1470 | ≥1570 |
Where Refractories Are Used
Industry
Steel & Iron
Refractories in iron and steel production are used in the blast furnace, hot blast stove, cast house and coke oven on the ironmaking side, and in the hot metal ladle, converter, electric arc furnace, steel ladle, tundish, RH degasser and reheating furnace on the steelmaking side. Material selection varies by operating zone and includes silica, high alumina, magnesia, magnesia-carbon, alumina-silicon carbide-carbon and silicon carbide products together with castables, ramming mixes and mortars.
Explore IndustryIndustry
Glass
Refractories in the glass industry line the melting tank, the superstructure, the working end and forehearth, the throat and the regenerator. Different furnace types take different materials, in fused, siliceous and magnesia groups: silica, clay, high alumina, sillimanite, mullite, fused mullite, zirconia-corundum, fused corundum and zirconium-containing refractory bricks.
Explore IndustryIndustry
Chemical & Petrochemical
Refractories in chemical and petrochemical plants line coal water slurry and residue oil gasifiers, secondary reformers, carbon black reactors, hydrogen production furnaces, gas generators and cracking furnaces. The technical reference's gasifier schemes build the lining from a high chrome brick working face, a chrome corundum brick backing, an alumina bubble brick insulating layer, refractory castables and a ceramic fibre coating or felt against the shell.
Explore IndustryIndustry
Cement
Refractories in cement plants line the preheater, the calciner and tertiary air duct, the rotary kiln from the kiln inlet through the safety, transition and burning zones to the kiln outlet, the kiln hood and burner, and the grate cooler. RISING's kiln configuration tables assign alkali-resistant bricks and castables to the preheater system, silicon mullite, magnesia spinel and magnesia-chrome bricks to the kiln zones, and low-cement and steel-fiber castables to the kiln mouths, hood and cooler.
Explore Industry
Available grades, shapes and sizes
Available grades
- JM23
- JM25
- JM26
- JM27
- JM28
- JM30
- JM32
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Technical Consultation
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