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Gleason Ball Clay

Description: Fine grainding plastic ball clay

Oxide Analysis Formula
CaO 0.09% 0.01
K2O 0.32% 0.01
MgO 0.04% -
Na2O 0.07% -
TiO2 1.48% 0.07
Al2O3 26.28% 1.00
P2O5 0.11% -
SiO2 58.80% 3.80
Fe2O3 1.41% 0.03
MnO 0.01% -
LOI 11.60%n/a
SO3 0.02%n/a
Oxide Weight 343.92
Formula Weight 389.14


The manufacturer describes it as a fine-grained engineered blend offering excellent bonding and forming characteristics. Ideally suited for extrusion, dry and wet pressing applications. This material is an alternative to, for example, OM#4, it has a lower coal content and fires a little lighter in color.

Related Information

Gleason ball clay fired test bars from cone 7-11 oxidation and cone 10 reduction

The oxidation bars (lower) are typical of most ball clays. They burn off-white and darken slightly in color as they approach maturity (above cone 10). Ball clays are fairly refractory, often as much more more than common fireclays. Ball clays almost always have some soluble salts and these reveal themselves in reduction firing (top bar).


Typecodes Ball Clay
Ball clays are abundant and very plastic and are used in all types of plastic forming bodies. They are not as white-burning or refractory as kaolins but lower in iron and fluxes than bentonites.
Materials OM #4 Ball Clay
Materials Foundry Hill Creme
By Tony Hansen
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