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Capital Refractories supply a range of insulating materials to for use between ladle shells and the cast lining to control heat loss. These include: insulation boards, foil wrapped flexible boards, moist felt and bricks. They are also used in other applications such as auto-pour units.
Moist Felt is supplied in 0.5 m widths and 1 m lengths and 5 mm thicknesses.
Foil-wrapped Insulation Boards are supplied in a wide range of sizes with thicknesses of 3, 5, 7 and 10 mm.
Capital also supplies a range of insulating castables installed by vibro-casting or gunning.
Below is a table of some commonly used products that we supply.
| Product Name | Description |
| Supra Brick | General purpose insulating refractory bricks are used under Firebrick Hearths or as backup insulation lining. |
| Calcium Silicate Board | Non-combustible and asbestos free insulation material used in a wide variety of applications for backup insulation. |
| Microporous Board | Extremely low thermal conductivity board. |
| Superflex | Flexible microporous thermal insulation materials with extremely low thermal conductivity. Widely used to back curved surfaces. |
| Product Name | Al2O3 | SiO2 | Fe2O3 | CaO | Other |
| Supra Brick | 9 | 77 | 7 | 1 | - |
| Calcium Silicate Board | <1 | 47 | <1 | 42 | - |
| Microporous board | - | 80 | - | - | SiC 15 |
| Superflex | 10 | 60 | - | - | ZrO2 25 |
| Product Name | Maximum Service Temperature / °C | Bulk Density / g cm-3 | Thermal Conductivity / W m-1 K-1 | |
| 400 °C | 800 °C | |||
| Supra Brick | 950 | 0.75 | 0.2 | 0.2 |
| Calciuim Silicate Board | 1000 | 0.23 | 0.1 | 0.1 |
| Microporous Board | 1000 | 0.23 | 0.02 | 0.04 |
| Superflex | 1000 | 0.35 | 0.02 | 0.04 |
