Carbondale Clay

Alternate Names: Carbondale Red Clay, C-Red

Description: Deep-red-burning medium-fire clay

Oxide	Analysis	Formula
CaO	0.30%	0.02
K2O	0.38%	0.02
MgO	0.26%	0.03
Na2O	0.06%	-
TiO2	1.03%	0.05
Al2O3	24.30%	1.00
SiO2	49.30%	3.44
Fe2O3	12.70%	0.33
LOI	11.80%	n/a
Oxide Weight		370.77
Formula Weight		420.37

Notes

No longer available, replaced by C-Red, then Guage Red. The manufacturer said: "C-Red is a fine-grained, iron-bearing, plastic clay. Great for throwing bodies or where warm color and plasticity are desired. Air floated."

Carbondale Red provided formulators with an economical source of iron oxide. Its very high iron content and refractory nature made it well suited for ceramic applications requiring bright red color. It fired to a toasty red up to about cone 3 and then turned dark red to brown (partly due to soluble salts on the surface that darken the color). This material had plasticity similar to a typical pottery clay body.

Some have suggested this as a substitute for Newman Red, however, this is much more vitreous and higher in iron.

Industrial Minerals states: "Due to the variations of naturally occurring clays and minerals which limit our quality control and the variety of applications for our products over which we have no control, our products are sold with the understanding that the user is solely responsible for determining suitability for any purpose." They were buying this material from another company and there was limited supply.

Related Information

Carbondale Red fired clay bars

Top to bottom cone 5, 4, 7, 8 oxidation. This material is extremely high in iron and very red-burning.

Links

Materials	Newman Red Clay
Materials	Redart The most common commercially 200 mesh available raw terra cotta clay in North America. It fires red, has low plasticity and matures a low kiln temperatures.
Materials	C-Red Clay
Materials	Gauge Red
Typecodes	Clay Other Clays that are not kaolins, ball clays or bentonites. For example, stoneware clays are mixtures of all of the above plus quartz, feldspar, mica and other minerals. There are also many clays that have high plasticity like bentonite but are much different mineralogically.
URLs	https://www.clayimco.com/industrial-clays IMCO information on their mined clays

By Tony Hansen
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