Todd Dark Ball Clay

Description: Kentucky Ball Clay

Oxide	Analysis	Formula
CaO	0.70%	0.05
MgO	0.60%	0.06
Na2O	0.10%	0.01
TiO2	1.10%	0.05
Al2O3	26.20%	1.00
SiO2	51.30%	3.32
Fe2O3	1.30%	0.03
LOI	17.70%	n/a
Oxide Weight		316.51
Formula Weight		384.58

Notes

A fine grained ball clay with excellent strength and plasticity.
The colloindal organic present in Todd Dark enhances the performance characteristics of this clay in casting and plastic formed bodies.

Physical Properties
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Water of Plasticity*: 37.0%
% Dry Shrinkage*: 6.5
Dry M.O.R., psi:* 825
pH: 4.4
C.E.C., meq/100g: 11.0
Specific Surface Area, sq metre/g: 24.4
Soluble sulfur+: Low

P.C.E.: 32

Particle Size, Microns: 20 10 5 2 1 0.5 0.2
(% finer than) 99% 97% 93% 81% 72% 56% 35%

Fired Properties
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Cone 5 10
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Total Shrinkage: 13.0% 14.5%
Absorption: 10.0% 1.0%

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*Extruded, 50% ball clay, 50% flint
+Low-trace to 150, Med-150-400, High-450+
**50% Clay, 50% Nepheline Syenite

Related Information

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Materials	Ball Clay A fine particled highly plastic secondary clay used mainly to impart plasticity to clay and porcelain bodies and to suspend glaze, slips and engobe slurries.
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.

By Tony Hansen
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