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Banta Red Clay

Oxide Analysis Formula
CaO 1.97% 0.16
K2O 0.08% 0.00
MgO 1.96% 0.23
Na2O 0.16% 0.01
Al2O3 22.00% 1.00
SiO2 60.70% 4.68
Fe2O3 5.00% 0.14
LOI7.50%
Oxide Weight 425.94
Formula Weight 460.48

Notes

No longer available as of 2015. They recommend Burgundy as an alternative.

Banta was an iron bearing, low refractory plastic clay recommended for mid-range temperature formulations where color, strength, vitrification and low absorption qualities are needed. Raw color was green. The green strength was exceptionally high.

Sieve Analysis Typical:
80 mesh trace
100 mesh 0.2%
200 mesh 4.0%

Drying Shrinkage: 7.7%
Fired Shrinkage cone 4: 13.8%
Dry Strength: 1006
Fired Strength cone 4: 5092
Fired Color: Reddish brown
Absorption cone 4: 0.8%
P.C.E.: cone 7
pH: 8.2

Industrial Minerals states: Due to the variations of natural 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.

Related Information

Links

Articles Understanding the Terra Cotta Slip Casting Recipes In North America
This article helps you understand a good recipe for a red casting body so that you will have control and adjustability.
Materials Redart
Materials IMCO Burgundy
Suppliers Industrial Minerals Co
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 http://www.clayimco.com/local-clays.html
IMCO information on their mined clays

By Tony Hansen


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