FreeShip, Clay, Imco 800, Stoneware/Fireclay- (Prompt rebate on orders with 3 or more FreeShip items!))

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This is a versatile clay, with a wide firing range making it very useful as both a fireclay and stoneware clay. It is more often used as the core component around which clay bodies are built to suit the properties needed by the individual potter or sculptor. Some people like it better than GoldArt because it has a somewhat finer mesh size, even though both state they are 200 mesh. It is called a fireclay but it bloats at cone 11. Additions of alumina and silica are needed to make a higher fireclay. It has good plasticity and working qualities and yields a good number of pleasing gold/tan colors depending on oxidation/reduction fire and temperature. It contains small amounts of iron oxide and titanium dioxide that can produce darker reds, oranges, and greys in high reduction atmospheres such as wood firing.

With the addition of alumina and/or silica Imco 800 is versatile enough to be used alone (or with other refractories) as a high fired temperature (^10+) fireclay body for making kiln furniture and other refractory products. If fired at lower temps (^6 to ^10) it makes a wonderful base for many stoneware clays. The manufacturer says this is a milled and air floated Lincoln fire clay Ground to 200 mesh, this is a refractory plastic smooth tan burning very smooth plastic clay with kaolin-like working properties. It is yellowish in the raw state. DigitalFire states: "To formulate a substitute for Newman fireclay we mixed this 50:50 with Carbondale Red and added 15% silica and made a body having a recipe containing 50% Newman. The results showed that this mix has less color than Newman and is quite a bit more vitreous. Much more silica will be needed to cut the maturity and this will result in loss of color making the addition of iron necessary. "

And on the general fireclay page, Digital continues: " 'Fireclay' is a generic term that in the simplest terms refers to a refractory clay (one which can be fired to a high temperature without deforming or melting). Typically fireclays are plastic and have significant iron impurities. Light duty fireclays have a PCE of about 27 and super duty materials can melt as as high as cone 32.
The obvious use for fireclays is to make bricks and shapes for the structural elements in kilns and furnaces. These clay can be mixed with other materials to introduce air space in increase the insulating value of the product.
Fireclays are useful in many types of ceramics including brick, certain types of tile and sculpture and pottery clays. They impart plasticity and particle size distribution to the body and counter the early melting of any low temperature clays in the mix. For vitreous fireclay based bodies, considerable feldspar content is necessary.
Hundreds of different kinds of fireclays are available. However they are not normally interchangeable in body recipes since they vary drastically in plasticity, particle size, fired color, thermal expansion, and mineralogy."

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Dec 10, 2022

feliciae6