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Foundry Hill Creme

Alternate Names: New Foundry Hill Creme, Foundry Hill Cream, Foundary Hill Cream

Oxide Analysis Formula
CaO 0.50% 0.04
K2O 0.70% 0.04
MgO 0.50% 0.06
Na2O 0.55% 0.04
TiO2 0.50% 0.03
Al2O3 20.50% 1.00
P2O5 0.09% 0.00
SiO2 66.20% 5.48
Fe2O3 1.60% 0.05
LOI8.20%
SO30.09%
Oxide Weight 453.48
Formula Weight 494.47

Notes

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
----
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'.

Related Information

Original Container bag of Foundry Hill Cream clay

Foundry Hill Creme fired test bars

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.

Links

Suppliers H. C. Spinks Clay Company Inc.
Typecodes Clay Other
Clays that are not kaolins, ball clays or bentonites. For example, stoneware clays are mixtures of all of the above plus quartz, feldspar, mica and other minerals. There are also many clays that have high plasticity like bentonite but are much different mineralogically.
Materials Gleason Ball Clay

Data

Pyrometric Cone Equivalent31

By Tony Hansen


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