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Alternate Names: Shefield Slip Clay
Description: Albany slip substitute
Oxide | Analysis | Formula | |
---|---|---|---|
CaO | 5.90% | 0.39 | |
MgO | 4.70% | 0.43 | |
K2O | 3.10% | 0.12 | |
Na2O | 1.00% | 0.06 | |
TiO2 | 0.90% | 0.04 | |
Al2O3 | 14.80% | 0.54 | |
SiO2 | 56.10% | 3.45 | |
Fe2O3 | 3.10% | 0.07 | |
FeO | 2.40% | 0.11 | |
LOI | 8.00% | n/a | |
Oxide Weight | 339.69 | ||
Formula Weight | 369.23 |
Utilizes Sheffield glacial clay, a native material, blended it with fluxing agents to duplicate the melting behavior of Albany Slip. The manufacturer claims that it yields a glaze designed to duplicate 100% Albany at cone 10 in either reduction or oxidation.
Sheffield Clay, from which this is made, has an LOI of 8.0%. Yet the producers of this material list no LOI, retotaling their analysis to 100 (as if it has zero LOI). To make their analysis more useful we have retotalled it to 92 (assuming that this also has an LOI of 8.0, likely pretty close). If you have some and can measure the LOI more accurately please let us know your findings.
URLs |
http://www.sheffield-pottery.com/Albany_Slip_Substitute_and_Sheffield_Slip_s/189.htm
Sheffield Slip home page |
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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 |
Albany Slip
A pure low plasticity clay that, by itself, melted to a glossy dark brown glaze at cone 10R. It was a popular glaze ingredient for many decades. |
Materials |
Sheffield Clay
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