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•The secret to cool bodies and glazes is a lot of testing.
•The secret to know what to test is material and chemistry knowledge.
•The secret to learning from testing is documentation.
•The place to test, do the chemistry and document is an account at https://insight-live.com
•The place to get the knowledge is https://digitalfire.com
Alternate Names: New Foundry Hill Creme, Foundry Hill Cream
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| PCE - Pyrometric Cone Equivalent | 31 |
An intermediate-grained ball clay blend offering excellent moisture retention and more plasticity. In plastic bodies, for example, the moisture retention means that items will dry slower and this can lead to a more even drying 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'.
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By Tony Hansen 
