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

O

3

 20-22% 31-35% 25-27% 39-42%
Fe

2

O

3

 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





Process Flow Diagram