J-2 Ball Clay

Description: Tennessee 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
LOI	10.80%	n/a
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
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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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