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Fused alumina for investment-casting shell making

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Fused alumina for investment-casting shell making
The main component of white fused alumina is aluminum oxide. It is produced by melting high-purity alumina powder at high temperature in an electric arc furnace (the electric-fusion temperature is stable at up to 2250°C), followed by solidification into blocks and cooling. Because it undergoes a high-temperature fusion process, the alumina is primarily converted into the α-Al2O3 crystal form, substantially improving its toughness, hardness, and refractoriness.

Product Specifications

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Fused alumina for investment-casting shell making

 
The main component of white fused alumina is aluminum oxide. It is produced by melting high-purity alumina powder at high temperature in an electric arc furnace (the electric-fusion temperature is stable at up to 2250°C), followed by solidification into blocks and cooling. Because it undergoes a high-temperature fusion process, the alumina is primarily converted into the α-Al2O3 crystal form, substantially improving its toughness, hardness, and refractoriness.
Fused corundum for shell making in investment casting has low sodium content and good high-temperature performance. It can be used to produce corundum-based foundry coatings, and can also be used directly as the shell-making base material and shell-making facing sand for precision casting.

 
Production Specifications:

Fused corundum fine powder0-100#,0-200#,0-320#
Fused alumina sand200um,180um,150um,120um,100um,80um,70um,60um
Fused Alumina Micro Powder63um,50um,40um,28um,20um,10um,7um,5um,3.5um,2.5um,1.5um

 
Chemical composition (typical values):
 

Fused alumina fine powder (200-0#)AL2O399.55%
SiO20.04%
NA2O0.22%
Fe2O30.04%
CaO0.03%
Fused Alumina Grain (185 μm, 80 mesh)AL2O399.10%
SiO20.16%
NA2O0.32%
Fe2O30.08%
CaO0.04%
Fused corundum sand (100 microns, 120 mesh)AL2O399.10%
SiO20.16%
NA2O0.32%
Fe2O30.08%
CaO0.04%
Fused alumina micropowder (63 micrometers)Al2O399.67%
SiO20.02
NA2O0.15
Fe2O30.01
CaO0.03
Fused Alumina Micro Powder (14 μm)Al2O399.27%
SiO20.14
NA2O0.30
Fe2O30.06
CaO0.05

 
Physical properties:

ColorWhite
HardnessMohs 9.0
Service Temperature1900 ℃
Melting point2250 ℃
Specific gravity3.95g/cm3
Bulk Density3.6g/cm3
Bulk density1.55-1.95 g/cm3
Crystal formMulti-angular

 
Product Applications:
Raw material for producing foundry coatings: produced without dust extraction, with few impurities and good dispersibility.
Facing sand for precision-casting shells, base material for shell-mold casting, lost-foam casting, sand-mold casting, etc.: A full range of particle sizes is available and can be blended to suit different casting processes. Low-sodium fused alumina can replace zircon sand to reduce casting costs.
 
For more information about fused alumina for investment-casting shell making, please contact our sales team.

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FAQ

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Q1: Is your company a trading firm or a manufacturing plant? Where are your facilities located?
We are an export-oriented enterprise that integrates manufacturing and sales; we are not an intermediary. Our headquarters—handling international sales, order processing, documentation, and after-sales service—is located in the Liaocheng Economic and Technological Development Zone, serving as the hub for global client relations, order negotiations, and cross-border services. Our production facility is situated in Chiping District, Liaocheng City, and specializes in the R&D, smelting, processing, and testing of white fused alumina, brown fused alumina, and other fused alumina products. This allows us to manage the entire supply chain—from primary production and rigorous quality control to direct export.


Q2: What is your production capacity and supply capability? Can you ensure a stable, long-term supply?
Our production base in Chiping features mature production lines and comprehensive processing equipment, enabling large-scale, continuous manufacturing. We offer a stable supply of our full range of white fused alumina, brown fused alumina, and related fused alumina products. With ample inventory and well-organized production scheduling, we are fully equipped to handle bulk orders, recurring annual orders, and urgent requests during peak seasons, ensuring a reliable, long-term supply for our global clients.


Q3: What are your primary export products, and what are your core offerings?
Our core exports consist of three main series of fused alumina materials: brown fused alumina, white fused alumina, and other fused alumina products. We offer a comprehensive range of specifications and particle sizes that meet various international procurement standards. Brown fused alumina is our flagship product for cost-effective industrial abrasives and refractory raw materials; white fused alumina is designed for high-purity, high-precision grinding and polishing applications; and our broader fused alumina line serves high-end refractory, specialty ceramic, and precision abrasive tool sectors—covering the full spectrum of procurement needs across all market tiers.


Q4: What are the specific applications for these three types of fused alumina, and how should one choose the right product? 1. Brown Fused Alumina: Characterized by high toughness, excellent wear and impact resistance, and a strong price-performance ratio. It is suitable for general industrial applications such as metal sandblasting (rust removal), hardware grinding, the manufacturing of grinding wheels and sandpaper, metallurgical castable refractories, and lining materials for standard industrial furnaces. It serves as a versatile, all-purpose abrasive and refractory raw material.

2. White Fused Alumina: Features high purity, high hardness, and excellent self-sharpening properties, with a pure white appearance free from impurities. It is ideal for high-precision and high-cleanliness applications, including the polishing of precision molds, grinding of aerospace components, finishing of electronic materials, and the production of high-end refractory products and precision ceramics.

3. Fused Alumina (High-Purity/Specialized): Possesses a dense structure, exceptional thermal stability, and high resistance to both heat and corrosion. It serves as a core raw material for high-end, specialized refractories, structural ceramics, precision grinding media, and linings for high-temperature industrial kilns, making it well-suited for demanding, high-performance operating environments.

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