C-B Clay

Alternate Names: Spinks C-B, C-B Ball Clay

Description: Ball Clay

Oxide	Analysis	Formula
CaO	0.26%	0.02
K2O	0.84%	0.03
MgO	0.23%	0.02
Na2O	0.22%	0.01
TiO2	1.50%	0.07
Al2O3	26.42%	1.00
P2O5	0.12%	-
SiO2	57.78%	3.71
Fe2O3	0.98%	0.02
MnO	0.02%	-
LOI	11.59%	n/a
SO3	0.06%	n/a
Oxide Weight		341.17
Formula Weight		386.16

Notes

Relative Viscosity (1.2 Sp. Gr.):* 1.47
Casting Rate: (gms per 15 min/426 cm2):* 190
Water of Plasticity:* 20.2
% Dry Shrinkage:* 4.86
Dry M.O.R., psi:* 700

Cone 04 8 11
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Fired Shrinkage:* 0.1% 1.0% 1.9%
Absorption:* 18.2% 16.9% 15.0%
M.O.R. psi:* 1600 3159 3497

Thermal Expansion, Cone 8: 0.48% at 700C
P.C.E.: 32
pH: 4.6
Oil Absorption: 35
Bulk Density, lbs per cubic foot: 35-40
Particle Size, Microns: 20 10 5 2 1 0.5 0.2
96% 88% 77% 60% 45% 27% 10%

*Specimens: De-aired, extruded, 50% ball clay, 50% flint

Related Information

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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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