Description
The JH-CG series is specifically engineered for coreless induction furnace applications where the coil requires electrical isolation, mechanical reinforcement, and molten metal run-out protection. This refractory material is applied on the inner side and between turns of the induction coil to deliver reliable insulation and structural support throughout furnace operations.
The JH-CG561AF grade is a red-coloured, fibre-reinforced grout with an Al2O3 content of 85.1%. It is trowel-applied and formulated for small-area repairs and hand-reachable locations where mould installation is impractical. The red colour allows easy visual distinction from the working lining during inspection and maintenance.
The JH-CG44 grade contains 92.5% Al2O3 and is designed for vibration casting installation. This corundum-based formulation is well suited to full-body cast coil grout layers and furnace pressure ring applications in melting and holding operations. The fine grain size of 2 mm supports dense packing and uniform coverage during casting.
The JH-CG66H grade features 92.0% Al2O3 and is engineered for self-flowing construction, making it suitable for full-body casting where high flowability is required. This grade eliminates the need for mechanical vibration during installation, reducing labor time and ensuring complete filling of complex coil geometries.
Key Features
- Provides electrical insulation between coil turns, preventing short circuits and improving safe operation of coreless induction furnaces.
- Forms a rigid mechanical layer that secures the induction coil and resists deformation under thermal and mechanical loads.
- Supports the working lining by providing a stable foundation that distributes thermal stresses evenly across the coil assembly.
- Three distinct grades accommodate different installation methods: trowel application for repairs, vibration casting for full-body layers, and self-flow construction.
- High alumina content in each grade ensures excellent thermal stability, chemical resistance, and long-term durability in demanding furnace environments.
Application
- Trowel-applied repair of damaged coil coating in small or confined areas where mould installation is not feasible.
- Full-body coil grout installation for new coreless induction furnaces using vibration casting to achieve uniform, dense coverage.
- Construction of furnace pressure rings where vibration-cast coil grout provides structural support and thermal insulation for the coil assembly.
- Self-flowing full-body casting for complex coil geometries where high flowability is required to fill intricate spaces without vibration.
- Maintenance and refurbishment of existing induction furnace coils, with grade selection based on installation method and access conditions.
Technical Specifications
The tables below list chemical composition, bulk density, grain size and installation method for each JH-CG grade.
| Chemical Composition [%] | JH-CG561AF | JH-CG44 | JH-CG66H |
| Al₂O₃ | 85.1 | 92.5 | 92.0 |
| SiO₂ | 3.9 | 0.6 | 0.6 |
| CaO | 4.9 | 3.6 | 4.0 |
| Technical Data | JH-CG561AF | JH-CG44 | JH-CG66H |
| Bulk Density (g/cm³) | 2.72 | 2.72 | 2.7 |
| Max Grain Size (mm) | 3 | 2 | 3 |
| Installation Method | Trowel | Vibration Cast | Self flowing construction |
