Grolleg Kaolin
Fine White Burning English Kaolin, English China Clay
| MLPT - Melting Point (MP) |
3000F |
| WABS - Water absorption |
1180C 14%
1280C 6%
1410C 0.5% |
| FSHR - Firing Shrinkage |
1180C 0%
1280C 14%
1410C 18% |
| UPSD - Ultimate Particle Size Distribution |
>53 microns .05 max
>10 microns 10
<2 microns 57 |
A blended English china clay, combining moderate plasticity, low titania content and relatively high flux content, low shrinkage and white fired color. It is excellent for making translucent throwing or casting porcelains. The pottery community uses many Grolleg based porcelains.
Its chemistry is different from a typical North American kaolin, it contains some fluxing oxides (e.g. it has almost 2% K2O). Thus porcelain bodies employing it require slightly less feldspar to vitrify.
For use in plastic porcelains there is dilemma that body formulators face: This material has a much lower plasticity than materials like #6 Tile and Sapphire kaolin. Thus porcelain bodies employing it require additions of a plasticizer like bentonite, in some cases up to 5%. Since bentonites having the necessary plasticity are also exceptionally high in iron, North Americans must balance the advantages of using a white burning and more costly material like this against the low plasticity that makes the addition of dirty plasticizers necessary. The low TiO2 content is a key factor for its usefulness in making translucent bodies and even 5% bentonite having 5% iron content will only increase iron in the body by 0.25%. However if plasticity and whiteness are important and translucency is secondary, you might find that more plastic kaolins are better for plastic bodies.
Glazes: While the chemistry difference between this and more typical kaolins is certainly worth noting for bodies, it is still likely close enough to the theoretical 1 alumina and 2 silica to be used in glazes that call for kaolin or china clay. However there may be exceptions where the titania in other kaolins could be detrimental to the development of a color (titanium can turn celedons to a greenish tint).
Modulus of Rupture, Kgf/cm2
At 80% Relative Humidity: 10.0
Dried at 110C: 25.7
Casting Rate @ 63% solids (mm2/min): 0.8
% P84 Deflocculant Required for 5 Poise Slip: 0.65
1180C 1280C 1410C
Brightness: 86 86 75
Mechanisms
Out Bound Links
- (Minerals - Contains)
Mica
See Muscovite.
- (Minerals - Contains)
Kaolinite
The most fundamental clay mineral. It is weathered... - (Materials - Related)
Super Standard Porcelain - White burning high strength Cornish kaolin
Super Standard Porcelain Kaolin
- (Materials - Parent)
Kaolin - Al2O3.2SiO2 or Al2Si2O5(OH)4 - Hydrated alumina silicate, Pure clay mineral
China Clay
- (Typecodes - Type)
1: KAO - Kaolin
- (MDT - Member)
North America
The decision about what materials to include in th... - (MDT - Member)
Europe
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Asia
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Australia
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Latin and South America
Latin America and South America. We are working on... - (MDT - Member)
Africa
All of continental Africa. We are working on this ... - (MDT - Member)
Ron Roy
This is the traditional Ron Roy materials file. He... - (MDT - Member)
Crystal Glazes
These materials are specially defined for makers o... - (MDT - Member)
New Zealand
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In Bound Links
Pictures
A grolleg porcelain (on the left) compared to a standard 4x25 porcelain (cone 10R).
A grolleg cone 10R porcelain (on the right) compared to a traditional porcelain made from North American kaolins (on the left).
Plainsman P580 (35:17:1.5 ball clay:kaolin:bentonite), H570 (10:46:2.5), P700 (50:5 Grolleg:bentonite) and Crysanthos Porcelain (China) fired in oxidation at cone 10.
XML for Import into INSIGHT
<?xml version="1.0" encoding="UTF-8"?>
<material name="Grolleg Kaolin" descrip="Fine White Burning English Kaolin, English China Clay" searchkey="Grolleg China Clay" loi="0.00" casnumber="95077-05-7">
<oxides>
<oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="0.100" tolerance=""/>
<oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="" percent="0.300" tolerance=""/>
<oxide symbol="K2O" name="Potassium Oxide" status="" percent="1.900" tolerance=""/>
<oxide symbol="Na2O" name="Sodium Oxide, Soda" status="" percent="0.100" tolerance=""/>
<oxide symbol="TiO2" name="Titanium Dioxide, Titania" status="" percent="0.030" tolerance=""/>
<oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="37.000" tolerance=""/>
<oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="48.000" tolerance=""/>
<oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="0.700" tolerance=""/>
</oxides>
<volatiles>
<volatile symbol="LOI" name="Loss on Ignition" percent="12.010" tolerance=""/>
</volatiles>
</material> | 
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