Alberta Slip
Albany slip substitute
Chemistry
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Volatiles
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Links to Other Materials
- Albany Slip - Related
- Ravenscrag Slip - Unspecified
- Alberta Slip II - Related
- Cache
Hazards
- Quartz, Crystalline Silica
Miscellaneous
- Family: Clay Other
- Region: North America
- Mined At: Unspecified
- Raw Mineral: No
- Generic: No
Notes
This material was formulated as a physical and chemical substitute for the late and very popular Albany Slip from New York state. Like Albany it is a low melting iron stained clay. Alberta Slip is more consistent than Albany was since it is made from a blend of raw materials.
Alberta slip has a slightly lower iron content than Albany had so some glazes may not fire as dark (this can be counteracted by adding additional iron oxide). Alberta slip melts as well and works in most glazes that call for Albany. Alberta slip is more plastic (less silty) so recipes containing larger proportions may shrink and crack during drying.
Complete information on how it was formulated can be found in the book Magic of Fire available from Digitalfire Corp. and at the web site http://digitalfire.com.
Plainsman Clays has made this material for many years and it is established in the market place across North America. You can use it at 100% to create a chocolate brown glossy glaze at cone 10 (but there is a problem with doing this as we shall see in a moment). Many Albany glazes are based on the addition of an active flux that increases melt fluidity so much that greenish and yellowish crystals grow on cooling to completely change the character of the surface. Many black glazes are also based on Alberta Slip, since it already contains lots of iron you only need to add a little more and some extra cobalt or manganese.
Plainsman has developed a new version II of this material also. The major problem with version I is that it is more much plastic than the silty Albany and glazes containing high proportions shrink excessively during drying and thus tend to crack. In fact is impossible to use Alberta Slip at 100% without calcining part of it for this reason. In version II they have replaced one of the plastic ingredients with the main silty Saskatchewan clay in Ravenscrag Slip. They have also fine tuned the mix a little to better match the chemistry of Albany. The result is a new Alberta Slip II that is great to work with. It has very close to the same melt fluidity and will likely be a one-for-one substitute (although we may put in a little more iron). However the real bonus is that version II can be used 100% to create a slurry that is a joy to work with and does not shrink and crack during drying (unless it is very thick). It fires as a deep almost-tenmoku glaze at cone 10. The variegation and character of the surface is actually quite stunning in reduction.
The plasticity of Alberta Slip I (which will continue to be available) is good where smaller amounts are used since it can assume the burden of suspending the glaze. However this new material really shines when it makes up the majority of the glaze.
Linked Articles
Duplicating Albany Slip
How Alberta Slip was created by analysing and duplicating the physical and chemical properties of Albany Slip
URLs
- Data Sheet - http://digitalfire.com/plainsman/data/alta.htm
Suppliers
- Plainsman Clays
Authors
- Tony Hansen (Owner)
XML
<?xml version="1.0" encoding="UTF-8"?>
<material name="Alberta Slip" descrip="Albany slip substitute" generic="0" rawmineral="0" searchkey="Archie Bray Slip" loi="0.00">
<families>
<family name="Clay Other"/>
</families>
<regions>
<region name="North America"/>
</regions>
<oxides>
<oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="6.500" tolerance=""/>
<oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="" percent="3.100" tolerance=""/>
<oxide symbol="K2O" name="Potassium Oxide" status="" percent="3.000" tolerance=""/>
<oxide symbol="Na2O" name="Sodium Oxide, Soda" status="" percent="2.200" tolerance=""/>
<oxide symbol="P2O5" name="Phosphorus Pentoxide" status="" percent="0.100" tolerance=""/>
<oxide symbol="TiO2" name="Titanium Dioxide, Titania" status="" percent="0.400" tolerance=""/>
<oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="13.800" tolerance=""/>
<oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="56.800" tolerance=""/>
<oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="4.800" tolerance=""/>
</oxides>
<volatiles>
<volatile symbol="" name="" percent="9.300" tolerance=""/>
</volatiles>
<references>
<reference name="seealso" reason=""/>
<reference name="seealso" reason=""/>
<reference name="seealso" reason=""/>
</references>
<hazards>
<hazard name="Quartz, Crystalline Silica"/>
</hazards>
<suppliers>
<supplier name="Plainsman Clays" country="CA" url="http://www.plainsmanclays.com" label=""/>
</suppliers>
<notes>
<note>This material was formulated as a physical and chemical substitute for the late and very popular Albany Slip from New York state. Like Albany it is a low melting iron stained clay. Alberta Slip is more consistent than Albany was since it is made from a blend of raw materials.
Alberta slip has a slightly lower iron content than Albany had so some glazes may not fire as dark (this can be counteracted by adding additional iron oxide). Alberta slip melts as well and works in most glazes that call for Albany. Alberta slip is more plastic (less silty) so recipes containing larger proportions may shrink and crack during drying.
Complete information on how it was formulated can be found in the book Magic of Fire available from Digitalfire Corp. and at the web site http://digitalfire.com.
Plainsman Clays has made this material for many years and it is established in the market place across North America. You can use it at 100% to create a chocolate brown glossy glaze at cone 10 (but there is a problem with doing this as we shall see in a moment). Many Albany glazes are based on the addition of an active flux that increases melt fluidity so much that greenish and yellowish crystals grow on cooling to completely change the character of the surface. Many black glazes are also based on Alberta Slip, since it already contains lots of iron you only need to add a little more and some extra cobalt or manganese.
Plainsman has developed a new version II of this material also. The major problem with version I is that it is more much plastic than the silty Albany and glazes containing high proportions shrink excessively during drying and thus tend to crack. In fact is impossible to use Alberta Slip at 100% without calcining part of it for this reason. In version II they have replaced one of the plastic ingredients with the main silty Saskatchewan clay in Ravenscrag Slip. They have also fine tuned the mix a little to better match the chemistry of Albany. The result is a new Alberta Slip II that is great to work with. It has very close to the same melt fluidity and will likely be a one-for-one substitute (although we may put in a little more iron). However the real bonus is that version II can be used 100% to create a slurry that is a joy to work with and does not shrink and crack during drying (unless it is very thick). It fires as a deep almost-tenmoku glaze at cone 10. The variegation and character of the surface is actually quite stunning in reduction.
The plasticity of Alberta Slip I (which will continue to be available) is good where smaller amounts are used since it can assume the burden of suspending the glaze. However this new material really shines when it makes up the majority of the glaze.</note>
</notes>
</material>
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