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J-2 Ball Clay

Oxide Analysis Formula
CaO 0.40% 0.03
K2O 0.50% 0.02
MgO 0.30% 0.03
Fe2O3 1.70% 0.04
Na2O 0.10% 0.01
TiO2 1.10% 0.05
Al2O3 28.40% 1.00
SiO2 56.70% 3.39
LOI10.80%
Oxide Weight 320.37
Formula Weight 359.15

Notes

A fine-grained Ball Clay with good plasticity and strength. J-2 is claimed to be very white-firing, however the high iron content does not suggest this. Industry applications include wall and floor tile, dinnerware and artware.

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
Suppliers K&T Clays
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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