CP#7 Ball Clay

Alternate Names: CP #7 Ball Clay, CP#7 Clay, Spinks CP#7 Ball Clay

Description: Refractory ball clay

Oxide	Analysis	Formula
CaO	0.30%	0.02
K2O	0.26%	0.01
MgO	0.10%	0.01
Na2O	0.05%	-
TiO2	1.60%	0.07
Al2O3	28.70%	1.00
P2O5	0.01%	-
SiO2	54.90%	3.25
Fe2O3	1.00%	0.02
LOI	12.50%	n/a
SO3	0.20%	n/a
Oxide Weight		308.91
Formula Weight		353.85

Notes

The manufacturer describes it as a fine-grained engineered blend offering high Al₂O₃ percentage and excellent PCE characteristics. Excellent fired color an plasticity make this product ideally suited for refractory and dinnerware applications.

Relative Viscosity (1.2 Sp. Gr.):* 1.31
Casting Rate: (gms per 15 min/426 cm2):* 248
Water of Plasticity:* 20.2
% Dry Shrinkage:* 5.13
Dry M.O.R., psi:* 905

Cone 04 8 11
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Fired Shrinkage:* 0.2% 1.9% 2.2%
Absorption:* 17.2% 13.4% 12.5%
M.O.R. psi:* 2320 4960 5790

Thermal Expansion, Cone 8: .535% at 700C
P.C.E.: 33
pH: 5.6
Oil Absorption: 35
Bulk Density, lbs per cubic foot: 33-38
Particle Size, Microns: 20 10 5 2 1 0.5 0.2
96% 93% 83% 65% 46% 29% 12%

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

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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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