- T: +44 (0) 1246 811163
All crucibles, alumina, magnesia and zirconia to name a few, are manufactured in Capital's own modern purpose-built facility in the Czech Republic where we press, cast and fire various materials into crucibles.
Capital Refractories is able to supply a full range of isostatically pressed crucibles from 2 kg capacity to 75 kg, in different grades and qualities. We use a state-of-the-art semi-automated cold isostatic press. Cold isostatic pressing applies pressure to the workpiece in all directions producing products of uniform density.
The advantages of Isostatically Pressed Crucibles are:
Crucibles are produced by vibration casting (vibrocast) when the required size or shape is uneconomical or impractical by the isopressing production method.
Capital Refractories can offer a range of vibration cast crucibles, including T-Pot Ladles:
Benefits
Complex shapes, e.g. internal pouring siphon
To complement our range of crucibles we also offer numerous ancillary products and materials used within the investment and related foundry industries.
| Quality | Description | |
| Zircon | ZN66I | Used for non-ferrous and precious metals |
| Zirconia | ..... | Used in the vacuum melting of superalloys and precious metals |
| ..... | ZC93I | General applications |
| ..... | ZC95I | High thermal shock resistance for noble metals |
| ..... | ZC96I | Fine grained structure for noble metals |
| Quality | Al2O3 | SiO2 | CaO | Fe2O3 | ZrO2 + HfO2 |
| Zircon ZN66I | 71.8 | 25.7 | 0.2 | 0.5 | 66.6 |
| Zirconia ZC93I | 0.8 | 1.2 | 4.0 | 0.1 | 93.0 |
| Zirconia ZC95I | 1.0 | 1.5 | 3.8 | <0.1 | 92.9 |
| Zirconia ZC96I | 0.6 | 0.9 | 4.4 | 0.1 | 94.0 |
| Quality | Bulk Density / g cm-3 | Apparent Porosity / % | Thermal Expansion / x10-6 K-1 | Thermal Conductivity / W m-1 K-1 | Maximum Service Temperature / °C |
| Zircon ZN66I | 2.32 | 21.5 | 4.2 | 1.8 | 1700 |
| Zircon ZC93I | 4.35 | 20.0 | 8.4 | 1.5 | 1850 |
| Zircon ZC95I | 4.50 | 18.5 | 8.5 | 1.6 | 1850 |
| Zircon ZC96I | 4.50 | 18.5 | 8.5 | 1.6 | 1850 |
