High Performance Magnesia Crucibles for Vacuum Melting Applications
AntsLAB’s Isostatically Pressed Magnesia Crucibles are manufactured for demanding vacuum melting applications where high purity, thermal stability, and long service life are essential.
The isostatic pressing process creates a dense and uniform refractory body that offers excellent resistance to thermal shock while maintaining structural integrity during repeated heating and cooling cycles.
The smooth, non-wetting surface minimizes metal adhesion and erosion, resulting in cleaner melts and reduced casting inclusions.
Compared to stabilised zirconia crucibles, Magnesia crucibles are lighter, more economical, and widely preferred for applications requiring X-ray analysis of cast components.
Their low thermal expansion allows the same crucible to be reused for multiple pours, helping reduce operating costs.
Available in round-bottom and flat-bottom configurations with capacities ranging from 8 kg to 265 kg, custom sizes are also available upon request. 
Features
- Isostatically pressed for high density and uniform structure
- Excellent thermal shock resistance
- Low porosity for cleaner melts
- Smooth non-wetting surface
- Reduced metal erosion
- Low thermal expansion
- Suitable for repeated pouring applications
- Available in round and flat-bottom designs
- Capacity range from 8 kg to 265 kg
- Cost-effective alternative to stabilised zirconia crucibles
- Compatible with most aerospace alloys
Technical Specifications
Chemical Composition
| Component | Value |
|---|---|
| MgO | 93.30% |
| Al₂O₃ | 1.86% |
| Fe₂O₃ | 0.11% |
| SiO₂ | 2.09% |
| CaO | 2.41% |
| Na₂O | 0.05% |
| K₂O | 0.01% |
Physical Properties
| Property | Value |
|---|---|
| Apparent Porosity | 21.73% |
| Bulk Density | 2770 kg/m³ |
Standard Size Range
| Format | Capacity Range | Inner Diameter (ID) |
|---|---|---|
| Round Bottom | 8.7 kg – 265 kg | 95 mm – 300 mm |
| Flat Bottom | 11.5 kg – 132 kg | 97 mm – 245 mm |
Custom sizes are available on request.
For complete dimensions and drawing numbers, please download the Product Brochure or contact our technical team.
Applications
- Vacuum induction melting
- Vacuum melting furnaces
- Aerospace alloy melting
- High-temperature alloy processing
- Foundry casting
- X-ray analysis casting
- Metallurgical research
- Materials science laboratories
Industries Served
- Foundries
- Aerospace manufacturing
- Steel plants
- Metallurgy laboratories
- Research & Development centres
- Quality control laboratories
Why Choose AntsLAB?
- ISO 9001:2008 certified manufacturing
- Consistent product quality
- Wide range of standard sizes
- Custom manufacturing available
- Technical guidance for crucible selection
- Compatible refractory consumables available
- Trusted by foundries and research laboratories
Frequently Asked Questions
They are used for melting high-temperature and aerospace alloys in vacuum induction and vacuum melting furnaces while producing cleaner, low-inclusion metal melts.
Standard capacities range from 8 kg to 265 kg in both round-bottom and flat-bottom designs.
Magnesia crucibles are lighter, more economical, and commonly preferred for X-ray inspection of cast components.
Yes. Their low thermal expansion allows repeated use across multiple melting cycles.
Yes. They are compatible with most aerospace alloy grades.
Yes. MIPEX Dry Crucible Backing Mix is specifically recommended for use with Magnesia Crucibles.
Yes. Custom dimensions can be manufactured based on your furnace requirements.
Yes. Our technical team can recommend the correct crucible size, configuration, and compatible backing materials.
Need the Right Magnesia Crucible for Your Furnace?
Share your furnace specifications and required capacity, and our technical experts will recommend the most suitable crucible and backing material for your application.
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