Expanded Clay Aggregates
Alfa expanded clay is an efficient and lightweight aggregate with outstanding fire resisting and insulation properties..
Three specific types of lightweight expanded clay aggregate are manufactured at our Kingsley factory in Staffordshire; EFG, REFAG and K25. A wide range of high quality clays are selected from around the United Kingdom, and from the Kingsley quarry. These clays are carefully mixed and blended to assure a consistent and stable chemical composition and then sintered on a moving hearth to form a porous ceramic sinter. Following a cooling period, the sinter is crushed and screened into fractions thus producing a range of grain sizes to suit customer requirements. All our refractory grade aggregates have low bulk density, high thermal insulation and refractoriness.
Applications
All grades are sold world-wide for a range of applications, which include:
- Insulating refractory concretes for casting and gunning
- Additions to clay mixes to produce semi-insulating firebricks
- Back up insulation as loose fill and no-fines concretes
- High temperature ladle cover compositions
- Filler for ingothead tiles in steel making
- Filtration
Packing
Available in:
- Polythene valve sacks 20-25kg each depending on grain size, shrink wrapped on pallets 1.0-1.2 tonnes per pallet
- IBC's 1.0-1.2 tonnes per bag. Also half size bag available
- Loose bulk available in bulk tipper or silo tanker
- Special packing available to customer specification by arrangement
Export
We export our materials extensively all over the world, and quotations can be readily provided to all destinations. Containers to deep-sea destinations are filled to capacity to minimise shipping costs. 40ft containers can be filled with IBC's or palletised sacks.
Tech data
Insulating Refractory Aggregates
| K25 | EFG | EFG Low Iron | REFAG | |
| A2 2 O3 |
20-22% | 31-35% | 25-27% | 39-42% |
| Fe 2 O3 |
6.5-8.0% | 2.0-3.5% | 1.8-2.0% | 1.9-2.3% |
| Pyrometric Cone Equivalent | Cone 10 1300°C |
Cone 23-26 1610°C-1645°C |
Cone 17-18 1512°C-1522°C |
Cone 32-33 1717°C-1745°C |
| Loose Density Kg/M3 | 600-1050 | 625-1100 | 625-1100 | 630-1100 |
| Sizes Available | 10-5mm
5-2mm
5-0mm
2-0mm
Special grades available to customer requirements |
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Process Flow Diagram
