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CP#7 Ball Clay

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

Oxide Analysis Formula
CaO 0.30% 0.02
K2O 0.26% 0.01
MgO 0.10% 0.01
Na2O 0.05% 0.00
TiO2 1.60% 0.07
Al2O3 28.70% 1.00
P2O5 0.01% 0.00
SiO2 54.90% 3.25
Fe2O3 1.00% 0.02
LOI12.50%
SO30.20%
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
----
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

Related Information

Links

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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