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Todd Dark 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
LOI17.70%
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
===================
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
================
Cone 5 10
----
Total Shrinkage: 13.0% 14.5%
Absorption: 10.0% 1.0%

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

Related Information

Links

Materials Ball Clay
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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