|Monthly Tech-Tip |
A very high-melting zero-plasticity material used in the refractories industry to make castables, brick, ramming and gunning mixes, mortars and potters grog. This material is fairly clean (speck free) and also answers a common need for stoneware clay bodies: An economical addition that will make the body more refractory but not add to its plasticity and produce drying problems.
It is fairly coarse and available in many particle sizes, the finest of which is 5-10% retained on a 70 mesh screen. Special sizes are available for custom orders.
The company calcines the materials and makes many grades of aggregate products.
Fireclays are non-kaolin non-ball clay materials similar to stoneware clays but lacking fluxing oxides. Many fireclays have a PCE of 28 or more.
Calcining is simply firing a ceramic material to create a powder of new physical properties. Often it is done to kill the plasticity or burn away the hydrates, carbonates, sulfates of a clay or refractory material.
|By Tony Hansen|
Follow me on