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Sheffield Slip

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.

Related Information


Sheffield Slip home page
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
By Tony Hansen
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