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Velvacast Kaolin

Large Particle Size Kaolin

Alternate Names: Velva Cast

OxideAnalysisFormula
CaO0.26%0.012
MgO0.18%0.012
TiO21.10%0.036
Al2O338.91%1.000
SiO245.49%1.984
Fe2O30.37%0.006
LOI13.70
Oxide Weight226.26
Formula Weight262.17
If this formula is not unified correctly please contact us.
PCE - Pyrometric Cone Equivalent 34-36

A large particle size kaolin intended for casting slips. It is low in plasticity and fires a darker color than what the reported iron would indicate? Combining some of this material with other kaolins of finer particle size in casting recipes will reduce casting times because of the greater permeability of the slip.

Kaolins of this type are also valuable for use in tuning the shrinkage and plasticity of slips or engobe applied to wet, leather hard or dry ware (as opposed to using more expensive calcined kaolins). Because their shrinkage is very low, they can be substituted for part of the regular kaolin and there will be minimal impact on the fired properties.


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By Tony Hansen

XML for Import into INSIGHT

<?xml version="1.0" encoding="UTF-8"?> <material name="Velvacast Kaolin" descrip="Large Particle Size Kaolin" searchkey="Velva Cast" loi="0.00" casnumber="95077-05-7"> <oxides> <oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="0.260" tolerance=""/> <oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="" percent="0.180" tolerance=""/> <oxide symbol="TiO2" name="Titanium Dioxide, Titania" status="" percent="1.100" tolerance=""/> <oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="38.910" tolerance=""/> <oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="45.490" tolerance=""/> <oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="0.370" tolerance=""/> </oxides> <volatiles> <volatile symbol="LOI" name="Loss on Ignition" percent="13.700" tolerance=""/> </volatiles> </material>


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