Maximum service temperature: 1400–1780°C, depending on grade
Thermal shock resistance: Withstands repeated rapid heating and cooling
Chemical resistance: Durable against slags, molten metals, alkali, and gases
Mechanical strength: Resistant to abrasion, impact, and load pressure
Operational stability: Prevents hot spots, spalling, or lining collapse
(1) Good high temperature strength
(2) Good thermal shock resistance
(3) Wear resistance and erosion resistance
(4) Strong chemical stability
(5) Good volume stability
(6) Good corrosion resistance
(7) Low high temperature creep rate
Iron and steel industry, non-ferrous metal industry,building materials industry, power industry
|
Item |
Index |
||||
|
GLJ-50 |
GLJ-60 |
GLJ-65 |
GLJ-70 |
GLJ-80 |
|
|
Al2O3（%≥） |
50 |
60 |
65 |
70 |
80 |
|
Cold pressing strength≥Mpa |
25 |
30 |
35 |
35 |
40 |
|
Heating line changes (1500°C 3h) % |
±0.8 （1350°C） |
-0.8~ +0.8 （1400°C） |
±0.8 （1500°C） |
||
|
Body density（g/cm3） |
2.15 |
2.30 |
2.40 |
2.45 |
2.65 |
|
Refractoriness（℃≥） |
1700 |
1720 |
1720 |
1720 |
1780 |
High alumina castables are engineered refractory materials designed for high-temperature environments in multiple industrial sectors, including steelmaking, cement production, power generation, glass manufacturing, and petrochemicals. These castables provide critical protection for furnace linings, ensuring operational safety, energy efficiency, and longevity of equipment.
Modern industrial furnaces face extreme challenges: temperatures exceeding 1500°C, aggressive slag corrosion, thermal cycling, mechanical abrasion, and chemical attack. High alumina castables are formulated to withstand these conditions while maintaining mechanical strength, structural stability, and thermal integrity.
By using high-quality castables, industrial operators can reduce downtime, extend lining life, and improve process efficiency. Highland Refractory has over 30 years of experience in supplying high-performance refractory solutions tailored for demanding industrial applications.
High alumina castables are non-metallic refractory materials primarily composed of alumina (Al₂O₃). They may include magnesia (MgO), silica (SiO₂), or other oxides depending on the intended service environment. Unlike pre-formed bricks, castables are applied in-situ using casting, gunning, or prefabrication, providing joint-free linings and custom-shaped installations for complex furnaces.
Core Properties of High Alumina Castables:
Maximum service temperature: 1400–1780°C, depending on grade
Thermal shock resistance: Withstands repeated rapid heating and cooling
Chemical resistance: Durable against slags, molten metals, alkali, and gases
Mechanical strength: Resistant to abrasion, impact, and load pressure
Operational stability: Prevents hot spots, spalling, or lining collapse
By selecting the right grade, castables can meet specific industrial needs, balancing strength, refractoriness, wear resistance, and insulation properties.
High alumina castables are classified based on cement content, alumina content, and installation method.
Low Cement Castable (LCC): Cement content 3–5%, good thermal shock resistance and mechanical strength; used for steel ladles, BOF/EAF converters, and furnace linings.
Ultra-Low Cement Castable (ULCC): Cement <3%, excellent corrosion resistance and low expansion; suitable for cement kilns, rotary kilns, and high-abrasion zones.
Self-Flowing Castable: Cement 3–5%, designed for easy installation in complex shapes; used in boilers, furnace corners, and irregular cavities.
| Grade | Al₂O₃ Content | Maximum Service Temperature | Typical Applications |
|---|---|---|---|
| HA60 | 60% | 1450°C | Low-temperature rotary kilns, minor wear zones |
| HA65 | 65% | 1500°C | Steel ladles, tundishes, mid-temperature furnaces |
| HA70 | 70% | 1550°C | Cement clinker coolers, cement kiln lining |
| HA80 | 80% | 1600°C | High-wear zones, steel furnace throat, high-temperature rotary kilns |
Tip: Higher alumina content improves refractoriness and chemical resistance, making the castable suitable for demanding high-temperature applications.
Equipment:
Blast furnaces, BOF/EAF converters, ladles, tundishes, aluminum and copper melting furnaces
Requirements:
Resistance to basic slag and molten metal
Thermal shock stability for repeated heat cycles
High mechanical strength in high-abrasion zones
Recommended Grades: HA65–HA80, LCC or ULCC depending on lining position.
Application Notes:
Use gunning castables for vertical walls and corners
Low cement or ULCC grades for zones exposed to chemical attack
Precast blocks may be combined with castables for complex furnace geometries
Equipment: Preheater cyclones, rotary kilns, calciners, clinker coolers
Challenges:
Alkali attack from raw materials
Abrasion from clinker and raw meal
Thermal cycling during start-up and shut-down
Recommended Grades: ULCC HA65–HA70; self-flowing grades for complex or tight zones
Application Notes:
Ensure proper mixing ratio and moisture content before casting
Gradual heating after installation to avoid cracks
Use expansion joints in large kiln sections to accommodate thermal expansion
Equipment: Steam boilers, waste-to-energy boilers, industrial furnaces
Requirements:
High erosion resistance
Good thermal shock performance
Low thermal conductivity in insulation layers
Recommended Grades: Low cement HA65/HA70; prefabricated gunning castables for complex geometries
Application Notes:
Maintain correct curing and drying procedures to avoid spalling
Monitor boiler pressure and thermal load to select suitable castable density
Equipment: Melting tanks, regenerators, forehearths, kiln crowns
Challenges: Highly corrosive molten glass, rapid thermal cycling
Recommended Grades: HA60–HA70, sometimes with zircon or spinel additives for ultra-high temperature zones
Application Notes:
Use self-flowing castables for difficult-to-reach areas
Implement periodic inspection for spalling or chemical wear
Applications: Gasifiers, cracking furnaces, catalytic reforming units, reactors
Challenges: High pressure, reducing atmosphere, carbon deposition
Recommended Grades: ULCC high alumina or chemically bonded monolithic castables
Application Notes:
Chemical-resistant additives recommended for acidic/basic environments
Monitor temperature gradients to maintain lining integrity
| Feature | Range | Industrial Importance |
|---|---|---|
| Refractoriness | 1450–1780°C | Determines maximum operating temperature |
| Density | 2.0–3.2 g/cm³ | Affects strength and thermal conductivity |
| Porosity | 12–28% | Influences insulation performance |
| Thermal Shock Resistance | 25–40 cycles | Critical for furnaces with rapid temperature changes |
| Chemical Resistance | High | Prevents corrosion from slags, metals, or gases |
| Wear Resistance | High | Essential for cement, steel, and power plant applications |
These parameters should guide material selection according to specific furnace or kiln conditions.
6.1 Preparation:
Verify mixing ratios and moisture content
Ensure clean installation area free from debris and dust
Pre-soak porous surfaces if necessary
6.2 Casting / Gunning:
Fill cavities fully to avoid air pockets
Compact with proper vibration if casting
Maintain recommended thickness according to design
6.3 Drying / Curing:
Heat slowly at 50°C per hour to 110°C to remove moisture
Gradually increase temperature to operation level
Use insulation blankets for uniform drying
6.4 Maintenance:
Inspect lining periodically using thermal imaging
Repair minor spalling using gunning or patching
Track service life and document chemical exposure
| Condition | Recommended Castable |
|---|---|
| Acidic environment | HA60–HA65 with silica or zircon additive |
| Basic slag | HA70–HA80, low/ultra-low cement |
| High abrasion | HA75–HA80, dense castable |
| Insulation requirement | HA60–HA65, self-flowing or low cement |
| Complex shape | Self-flowing / gunning castable |
| Temperature >1600°C | White corundum or zircon-enhanced castable |
Always consult engineers for custom furnace designs or extreme operating conditions.
Q1: What temperature range can high alumina castable withstand?
A: Typically 1400–1780°C depending on alumina content and grade.
Q2: Can high alumina castable be used in steel ladles?
A: Yes, HA65–HA80 low or ultra-low cement castables are ideal for ladles and converters.
Q3: How to avoid premature failure?
A: Correct selection, proper installation, controlled curing, and preventive maintenance are key.
Q4: What’s the difference between firebrick and castable?
A: Bricks provide fixed structure; castables allow joint-free linings and flexible shapes.
Q5: Are castables insulating?
A: Some low cement or porous grades provide insulation; dense castables prioritize strength.
Material: HA70 ULCC
Application: Rotary kiln transition zone
Outcome: Extended service life by 18 months, reduced maintenance downtime
Material: HA65 Low Cement Castable
Application: Steam boiler lining
Outcome: Improved thermal efficiency, reduced hot spot formation
Material: HA80 LCC
Application: BOF converter and ladle throat
Outcome: Enhanced abrasion resistance, minimal lining replacement
These case studies demonstrate real-world performance benefits, providing engineers with confidence in material selection.
A: Yes, we do provide free samples of our standard High Aluminum Castable. You only need to cover the shipping cost to your address. For customized High Aluminum Castable samples, a small fee might apply, but it will be refunded if you place a significant order later.
A: If it's our standard High Aluminum Castable in stock, you can expect delivery within 3 - 7 days. For customized High Aluminum Castable with specific properties like higher alumina content or special workability, it'll take 10 - 15 days as we'll need extra time for production and quality checks. For large - scale bulk orders, we'll work with you to set a suitable delivery schedule.
A: Our High Aluminum Castable is carefully packaged. First, it's sealed in moisture - proof bags to prevent moisture from affecting its performance. Then, these bags are placed in robust steel drums or well - reinforced wooden crates depending on the quantity. The containers are clearly labeled with handling instructions such as "Keep Dry" and "Handle with Care", along with product details.
A: We accept T/T (Telegraphic Transfer) and PayPal for payments. Just like with our other products, we require full payment before dispatching the High Aluminum Castable. We're always looking into adding more payment options to make it more convenient for our customers.
A: Absolutely. Every batch of High Aluminum Castable we produce undergoes strict quality control. You'll receive a detailed quality inspection report that includes information about its chemical composition, physical properties like density and strength, and its performance under high - temperature conditions. This will give you confidence in the quality of the High Aluminum Castable you purchase.
A: We're sorry if you receive damaged High Aluminum Castable. Please contact our customer service right away and provide photos and detailed descriptions of the damage. We'll promptly arrange to replace the damaged product with a new, undamaged batch at no extra cost to you.
High alumina fine powder is a powder material with alumina (Al2O3) as the main component.
Refractory cement, also known as aluminate cement, is a fire-resistant hydraulic cementitious material.
Steel fiber wear-resistant castables are widely used in high temperature and wear-resistant environments in many industrial fields such as metallurgy, building materials, and chemicals.
White corundum castable is a high-quality high-temperature refractory material with high-purity alumina powder as the main raw material.
Lightweight insulation castable is a refractory with low density and excellent insulation properties.
Corundum mullite castable is a high-quality high-performance refractory material with high thermal conductivity, insulation, good chemical stability and resistance to reducing agents.
Silicon carbide castable is an amorphous refractory material with silicon carbide as the main component.
Chrome corundum castable is a high-performance amorphous refractory material composed of corundum and chromium. It has high melting point, high hardness, high stability and excellent slag resistance and wear resistance.
high alumina cement is a powder material with alumina (Al2O3) as the main component.
Plastic is an amorphous refractory material in the form of hard mud and has high plasticity.
Refractory spray coating is a kind of amorphous refractory material, which is applied to the lining of thermal equipment by spraying construction method.
Widely used in a variety of furnace front package, transfer package, ladle insulation layer...
Widely used in a variety of furnace front package, transfer package, ladle insulation layer...
High temperature and high strength repair material is a special material used to repair equipment and structures in high temperature environments.
High alumina poly light brick is a high quality lightweight refractory material.
Low creep clay bricks have a low creep rate in high temperature environments and can maintain good shape and dimensional stability for a long time.
Silicon carbide plates are mainly composed of silicon carbide (SiC) as the aggregate (with a content usually ≥ 80%).
High alumina fine powder is a powder material with alumina (Al2O3) as the main component.
