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Alternate Names: New Foundry Hill Creme, Foundry Hill Cream, Foundary Hill Cream
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| PCE - Pyrometric Cone Equivalent | 31 |
Similar to a ball clay but having a lower drying shrinkage (about 6-6.5%). Although this is a fairly refractory clay, it has a high firing shrinkage, around 8% across the entire range from cone 7 to 11. Porosity drops slowly from cone 7 upward (7% down to 4% at cone 11 oxidation and 10 reduction). Used commonly in stoneware clay bodies.
The manufacturer states: An intermediate-grained engineered blend offering excellent moisture retention and plasticity properties. Ideally suited for a wide variety of stoneware applications and wet forming process.
Relative Viscosity (1.2 Sp. Gr.):* 1.28
Casting Rate: (gms per 15 min/426 cm2):* 209
Water of Plasticity:* 22.9
% Dry Shrinkage:* 3.94
Dry M.O.R., psi:* 239
Cone 04 8 11
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Fired Shrinkage:* 0.2% 1.6% 1.9%
Absorption:* 20.2% 17.8% 15.2%
M.O.R. psi:* 758 2390 4630
Thermal Expansion, Cone 8: .493% at 700C
P.C.E.: 30
pH: 5.9
Oil Absorption: 28
Bulk Density, lbs per cubic foot: 37-45
Particle Size, Microns: 20 10 5 2 1 0.5 0.2
88% 73% 60% 44% 33% 21% 8%
*Specimens: De-aired, extruded, 50% ball clay, 50% flint
Jim Robinson observes that this material holds all the glazes in his GTS series without shivering, 'probably because cristobalite is not able to form'.
Top: Cone 10R (soluble salts are staining the surface). Downward: Cone 11-7 oxidation. These look very similar to a typical ball clay, perhaps not firing quite as white.
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