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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
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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