TI-21 Ball Clay

Alternate Names: Hick TI-21, Old Hickory TI-21 Ball Clay

Description: Tennessee Ball Clay

Oxide	Analysis	Formula
CaO	0.07%	-
K2O	0.05%	-
MgO	0.20%	0.02
Na2O	0.09%	0.01
TiO2	1.58%	0.07
Al2O3	27.30%	1.00
SiO2	58.75%	3.65
Fe2O3	1.00%	0.02
LOI	10.90%	n/a
Oxide Weight		332.68
Formula Weight		373.37

Notes

Crude Color: Light Grey
Dry M.O.R. (psi 50% clay/50% flint, cast bars): 461
Wet Sieve Residue, +200 mesh (%): 0.51
Water of Plasticity (%): 35
Linear Dry Shrinkage (%): 6.6
Solubles Sulfates (ppm): 199
Filtration (ml): 26
Specific Surface Area (sq meters per gram): 18.1
CEC/MBI (meq/100 ml): 9.5
pH: 6.2
PCE: 31

Firing Shrinkage (%) Cone 04: 5.4 Cone 3: 5.6 Cone 11: 6.6
Absorption (%) 12.8 9.1 3.0

Particle Size (% finer than):
50 microns: 100
20: 97
10: 92
5: 85
1: 60
0.5: 48

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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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